# Low Idle and stalling **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** chevrolet, 1500\ **Created:** [August 8, 2017, 2:05pm UTC](https://community.cartalk.com/t/low-idle-and-stalling/106710 "2017-08-08T14:05:45Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![barteileen](https://avatars.discourse-cdn.com/v4/letter/b/ccd318/32.png) [@barteileen](https://community.cartalk.com/u/barteileen)\ **Post date:** [August 8, 2017, 2:05pm UTC](https://community.cartalk.com/t/low-idle-and-stalling/106710/1 "2017-08-08T14:05:45Z")
CHEVY C1500 1993 V8 5.7 L Truck has over 200,000 miles but the engine only has around 500 miles on it. My truck runs great except for when it first starts and when I drive really slow (i.e. pulling into a parking spot, coming to a stop at a stop light/sign, sitting in a drive thru). It has a rough idle, and many times I have to put it in park and give it a little gas to prevent it from stalling. I’ve replaced the IAC which improved this issue dramatically but it still idles rough when it first starts and when I come to stop the RPMs go wonky, it will either correct itself, or it will stall. The engine has been rebuilt within the last 6 months. It has a new throttle body and TPS. New O2 sensor and a bunch of other sensors. If anyone has any idea as to what it could be I would greatly appreciate it. ---
**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 8, 2017, 2:07pm UTC](https://community.cartalk.com/t/low-idle-and-stalling/106710/2 "2017-08-08T14:07:21Z")
What year? How many miles? What engine? Help us out a bit here and we’ll try and help you. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [August 8, 2017, 7:22pm UTC](https://community.cartalk.com/t/low-idle-and-stalling/106710/3 "2017-08-08T19:22:19Z")
Try unplugging the electrical connector for MAP sensor, and then see how it starts/idles. Tester ---
**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 8, 2017, 11:31pm UTC](https://community.cartalk.com/t/low-idle-and-stalling/106710/4 "2017-08-08T23:31:11Z")
Yeah, that edit still didn’t say what engine… 350, 305, 4.3 V6…Or how many miles? ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [August 9, 2017, 2:37am UTC](https://community.cartalk.com/t/low-idle-and-stalling/106710/5 "2017-08-09T02:37:29Z")
It sounds like it is running a little lean and/or the idle rpm is set too low. Have you checked for engine computer diagnostic codes? Your truck probably uses a flashing light method to read out codes rather than the fancy computerized scanners plugged into the obd ii port newer cars use, but it still provides diagnostic codes I expect. You might as well use that information, since it comes with the truck. If there are no codes, lots of possibilities for these symptoms, my guess is you’ve got a vacuum leak somewhere. Air is getting into the intake manifold using a path that isn’t allowed, bypassing the map sensor and throttle plate. The pcv system and the brake booster are two places to ask your shop to check.