# Rough idle ..stalling but only when breaking .. idles great and has a slight hesitation when u get on it hard **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** ford\ **Created:** [August 19, 2019, 6:06pm UTC](https://community.cartalk.com/t/rough-idle-stalling-but-only-when-breaking-idles-great-and-has-a-slight-hesitation-when-u-get-on-it-hard/147070 "2019-08-19T18:06:34Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![Jason\_Smith](https://avatars.discourse-cdn.com/v4/letter/j/b5e925/32.png) [@Jason\_Smith](https://community.cartalk.com/u/Jason_Smith)\ **Post date:** [August 19, 2019, 6:06pm UTC](https://community.cartalk.com/t/rough-idle-stalling-but-only-when-breaking-idles-great-and-has-a-slight-hesitation-when-u-get-on-it-hard/147070/1 "2019-08-19T18:06:35Z")
It has a rought idle and sometimes stalls when coming to a stop. Other than a slight hesitation when accelerating fast it idles great… any suggestions would be great ---
**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\ **Post date:** [August 19, 2019, 8:16pm UTC](https://community.cartalk.com/t/rough-idle-stalling-but-only-when-breaking-idles-great-and-has-a-slight-hesitation-when-u-get-on-it-hard/147070/2 "2019-08-19T20:16:05Z")
> [@Jason\_Smith](#): > > any suggestions would be great Any information AT ALL about the type of vehicle you are working on, the engine, the year, the model, ect, would be even better if you expect even the slightest bit of useful help ---
**Author:** ![It\_s-Me](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/it_s-me/32/12660_2.png) [@It\_s-Me](https://community.cartalk.com/u/It_s-Me)\ **Post date:** [August 19, 2019, 8:22pm UTC](https://community.cartalk.com/t/rough-idle-stalling-but-only-when-breaking-idles-great-and-has-a-slight-hesitation-when-u-get-on-it-hard/147070/3 "2019-08-19T20:22:28Z")
> [@Jason\_Smith](#): > > when accelerating fast it idles great That makes no sense. ---
**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/48514_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\ **Post date:** [August 19, 2019, 8:23pm UTC](https://community.cartalk.com/t/rough-idle-stalling-but-only-when-breaking-idles-great-and-has-a-slight-hesitation-when-u-get-on-it-hard/147070/4 "2019-08-19T20:23:38Z")
> [@Mustangman](#): > > Any information AT ALL about the type of vehicle you are working on, the engine, the year, the model, ect, would be even better if you expect even the slightest bit of useful help +1 Additionally, knowing the number of miles on the odometer would be helpful. ---
**Author:** ![VOLVO-V70](https://avatars.discourse-cdn.com/v4/letter/v/8e8cbc/32.png) [@VOLVO-V70](https://community.cartalk.com/u/VOLVO-V70)\ **Post date:** [August 19, 2019, 8:24pm UTC](https://community.cartalk.com/t/rough-idle-stalling-but-only-when-breaking-idles-great-and-has-a-slight-hesitation-when-u-get-on-it-hard/147070/5 "2019-08-19T20:24:08Z")
Don’t all 1949 Studebaker’s act this way ? ---
**Author:** ![It\_s-Me](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/it_s-me/32/12660_2.png) [@It\_s-Me](https://community.cartalk.com/u/It_s-Me)\ **Post date:** [August 19, 2019, 8:45pm UTC](https://community.cartalk.com/t/rough-idle-stalling-but-only-when-breaking-idles-great-and-has-a-slight-hesitation-when-u-get-on-it-hard/147070/6 "2019-08-19T20:45:46Z")
> [@VOLVO\_V70](#): > > Don’t all 1949 Studebaker’s act this way ? I thought that it was the M29 Weasel that had that problem. > **[Studebaker Weasel M29 - Univem Paris](https://univem-paris.com/en/project/studebaker-weasel-m29/)** > > Description, historical background, technical data and pictures of the Studebaker Weasel M29belonging to association Univem. ---
**Author:** ![tcmichnorth](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tcmichnorth/32/25126_2.png) [@tcmichnorth](https://community.cartalk.com/u/tcmichnorth)\ **Post date:** [August 19, 2019, 9:18pm UTC](https://community.cartalk.com/t/rough-idle-stalling-but-only-when-breaking-idles-great-and-has-a-slight-hesitation-when-u-get-on-it-hard/147070/7 "2019-08-19T21:18:12Z")
My Craftsman lawn mower experianced the same thing. New set of plugs she was up and running again. ---
**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/48514_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\ **Post date:** [August 19, 2019, 9:18pm UTC](https://community.cartalk.com/t/rough-idle-stalling-but-only-when-breaking-idles-great-and-has-a-slight-hesitation-when-u-get-on-it-hard/147070/8 "2019-08-19T21:18:21Z")
> [@VOLVO\_V70](#): > > Don’t all 1949 Studebaker’s act this way ? I am pretty sure that the OP must be driving a 1938 Hupmobile, but until he chooses to clarify matters, we are all guessing. ---
**Author:** ![Barkydog](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/barkydog/32/2470_2.png) [@Barkydog](https://community.cartalk.com/u/Barkydog)\ **Post date:** [August 19, 2019, 10:32pm UTC](https://community.cartalk.com/t/rough-idle-stalling-but-only-when-breaking-idles-great-and-has-a-slight-hesitation-when-u-get-on-it-hard/147070/9 "2019-08-19T22:32:57Z")
A vacuum leak in the hose that goes to the brake booster my first guess. ---
**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/48514_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\ **Post date:** [August 19, 2019, 10:37pm UTC](https://community.cartalk.com/t/rough-idle-stalling-but-only-when-breaking-idles-great-and-has-a-slight-hesitation-when-u-get-on-it-hard/147070/10 "2019-08-19T22:37:26Z")
Did '38 Hupmobiles or '49 Studebakers have a brake booster? Until we actually find out that make, model, and model year of the OP’s mystery vehicle, we are all just shooting in the dark, so to speak. ---
**Author:** ![Purebred](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/purebred/32/46796_2.png) [@Purebred](https://community.cartalk.com/u/Purebred)\ **Post date:** [August 20, 2019, 12:37am UTC](https://community.cartalk.com/t/rough-idle-stalling-but-only-when-breaking-idles-great-and-has-a-slight-hesitation-when-u-get-on-it-hard/147070/11 "2019-08-20T00:37:49Z")
NO, mine was idled and ran great, but 0-60 was probably more than 20 seconds. ![IMG_0198](https://global.discourse-cdn.com/cartalk/original/2X/5/5e56f972d0acc8e83d6e092b80330e985f713f9b.JPG) ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [August 20, 2019, 1:55am UTC](https://community.cartalk.com/t/rough-idle-stalling-but-only-when-breaking-idles-great-and-has-a-slight-hesitation-when-u-get-on-it-hard/147070/12 "2019-08-20T01:55:00Z")
without knowing anything about this mystery Ford vehicle . . . idle air control valve ---
**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/48514_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\ **Post date:** [August 21, 2019, 3:41pm UTC](https://community.cartalk.com/t/rough-idle-stalling-but-only-when-breaking-idles-great-and-has-a-slight-hesitation-when-u-get-on-it-hard/147070/13 "2019-08-21T15:41:00Z")
Two days later… 🙄