# 06 Mustang GT \[automatic\] stuttering when downshifting to go faster **URL:** \ **Category:** Power/Fuel\ **Tags:** mustang, ford\ **Created:** [April 18, 2021, 11:52am UTC](https://community.cartalk.com/t/06-mustang-gt-automatic-stuttering-when-downshifting-to-go-faster/176210 "2021-04-18T11:52:13Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![matrixscarz](https://avatars.discourse-cdn.com/v4/letter/m/eb9ed0/32.png) [@matrixscarz](https://community.cartalk.com/u/matrixscarz)\ **Post date:** [April 18, 2021, 11:52am UTC](https://community.cartalk.com/t/06-mustang-gt-automatic-stuttering-when-downshifting-to-go-faster/176210/1 "2021-04-18T11:52:13Z")
Hey guys, I drive an automatic 06 mustang gt convertible premium. basically stock. im not quite sure if it is a specific gear that this issue takes place in but im going to try to give as much info as i can. When im in lets say 3rd gear and i press down on my pedal so the gt downshifts to a lower gear but higher rpm, my rpms stutter or freeze in between 2000 and 3000. It doesnt accelerate and if i let go of the gas pedal then tap it again it downshifts no problem. sometimes it takes a few tries. I wasnt able to find a specific solution on the internet but binge watched many tutorials and videos talking about what the problem could be. I plan on replacing the spark plugs and possibly doing a throtle body cleanup. If anyone could tell me what is causing this problem Thnks. Also when im below 5 mph and i lightly tap on the gas (for example if I am in a store parking lot and just want to apply a little bit of pressure to move forward) I hear this disgusting crunching noise. The car doesnt drive differently during this but it is a horrible sound like someone just shot a bullet through the front of my engine. it runs perfect after I warm it up but I am mainly concerned about the first part rather than the last part. If you have any questions for me to help you better understand my issue feel free to ask. I am open to all suggestions, comments, or concerns… 🙂 edit: i got it read a few days ago and the code is: engine running too lean block 1 ---
**Author:** ![bloody\_knuckles](https://avatars.discourse-cdn.com/v4/letter/b/ee7513/32.png) [@bloody\_knuckles](https://community.cartalk.com/u/bloody_knuckles)\ **Post date:** [April 18, 2021, 12:42pm UTC](https://community.cartalk.com/t/06-mustang-gt-automatic-stuttering-when-downshifting-to-go-faster/176210/2 "2021-04-18T12:42:40Z")
I’m no expert but this sounds like a transmission issue. There are a couple of really smart folks here in the community who can probably add more clarity to the diagnosis. ---
**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:** [April 18, 2021, 1:16pm UTC](https://community.cartalk.com/t/06-mustang-gt-automatic-stuttering-when-downshifting-to-go-faster/176210/3 "2021-04-18T13:16:30Z")
How many miles on it? Is the check engine light on? ---
**Author:** ![matrixscarz](https://avatars.discourse-cdn.com/v4/letter/m/eb9ed0/32.png) [@matrixscarz](https://community.cartalk.com/u/matrixscarz)\ **Post date:** [April 18, 2021, 1:18pm UTC](https://community.cartalk.com/t/06-mustang-gt-automatic-stuttering-when-downshifting-to-go-faster/176210/4 "2021-04-18T13:18:13Z")
117k . my fuel gauge reads it half full when empty and when i fill it up it says check engune but goes away. and comes and goes ---
**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:** [April 18, 2021, 2:03pm UTC](https://community.cartalk.com/t/06-mustang-gt-automatic-stuttering-when-downshifting-to-go-faster/176210/5 "2021-04-18T14:03:22Z")
Have it read at Autozone or another parts place for free. If it showed the light, it will store a code. Post it here and we’ll try and help. It should be in the form P1234. The code says where to look, without it we are a bit in the dark. Pay little attention to what the counter person tells you. They are not mechanics. ---
**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\ **Post date:** [April 18, 2021, 8:26pm UTC](https://community.cartalk.com/t/06-mustang-gt-automatic-stuttering-when-downshifting-to-go-faster/176210/6 "2021-04-18T20:26:11Z")
There was a TSB about fuel pumps on that model but I would guess that’s already been corrected(?) And it’s remotely possible the “disgusting crunching noise” is a loose heat shield but that’s simply a guess. ---
**Author:** ![matrixscarz](https://avatars.discourse-cdn.com/v4/letter/m/eb9ed0/32.png) [@matrixscarz](https://community.cartalk.com/u/matrixscarz)\ **Post date:** [April 18, 2021, 8:58pm UTC](https://community.cartalk.com/t/06-mustang-gt-automatic-stuttering-when-downshifting-to-go-faster/176210/7 "2021-04-18T20:58:32Z")
Engine running too lean block 1 ---
**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:** [April 18, 2021, 9:08pm UTC](https://community.cartalk.com/t/06-mustang-gt-automatic-stuttering-when-downshifting-to-go-faster/176210/8 "2021-04-18T21:08:30Z")
> [@matrixscarz](#): > > Engine running too lean block 1 What was the actual code number Pxxxx There are 30 some codes that say bank 1 running lean, and they all mean something different. ---
**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:** [April 18, 2021, 11:09pm UTC](https://community.cartalk.com/t/06-mustang-gt-automatic-stuttering-when-downshifting-to-go-faster/176210/9 "2021-04-18T23:09:08Z")
> [@matrixscarz](#): > > Engine running too lean block 1 The code in the form P1234 like I asked, please. As @It\_s\_Me points out, there is more than one lean code. ---
**Author:** ![matrixscarz](https://avatars.discourse-cdn.com/v4/letter/m/eb9ed0/32.png) [@matrixscarz](https://community.cartalk.com/u/matrixscarz)\ **Post date:** [April 20, 2021, 6:41pm UTC](https://community.cartalk.com/t/06-mustang-gt-automatic-stuttering-when-downshifting-to-go-faster/176210/10 "2021-04-20T18:41:53Z")
I dont have that, ill have to get re read at a auto shop ---
**Author:** ![ledhed75](https://avatars.discourse-cdn.com/v4/letter/l/f6c823/32.png) [@ledhed75](https://community.cartalk.com/u/ledhed75)\ **Post date:** [April 20, 2021, 6:48pm UTC](https://community.cartalk.com/t/06-mustang-gt-automatic-stuttering-when-downshifting-to-go-faster/176210/11 "2021-04-20T18:48:24Z")
How is the transmission fluid? Like both the color and the fluid level? Has the fluid ever been changed?