# Trouble shoot, Chevy Truck **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [April 29, 2019, 2:24pm UTC](https://community.cartalk.com/t/trouble-shoot-chevy-truck/139475 "2019-04-29T14:24:57Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Kade\_Gibson](https://avatars.discourse-cdn.com/v4/letter/k/e99b99/32.png) [@Kade\_Gibson](https://community.cartalk.com/u/Kade_Gibson)\ **Post date:** [April 29, 2019, 2:24pm UTC](https://community.cartalk.com/t/trouble-shoot-chevy-truck/139475/1 "2019-04-29T14:24:57Z")
My 94 Cheyenne W/T 4.3 has problems with surging when im at a redlight or I turn the truck on and leave it in park or neutral until it eventually turns off. I can put it in drive and it will drive fine but it likes to surge and almost shake when I stop at red lights. Not entirely certain what do replace next. I replaced the O2 sensor, replaced the fuel pump and filter, within the past 2 years replaced the distributor cap wires and plugs and am definitely in need to do that again but I cant figure out what might cause this. Maybe it’s out of time and I need to replace the whole distributor rotar? Maybe the EGR Valve or the idle air control? What do yall think ---
**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:** [April 29, 2019, 2:36pm UTC](https://community.cartalk.com/t/trouble-shoot-chevy-truck/139475/2 "2019-04-29T14:36:17Z")
The problem might be the Idle Air Control valve hunting for the proper idle position. [https://www.rockauto.com/en/moreinfo.php?pk=935765&cc=1050983&jsn=461](https://www.rockauto.com/en/moreinfo.php?pk=935765&cc=1050983&jsn=461) Tester ---
**Author:** ![Kade\_Gibson](https://avatars.discourse-cdn.com/v4/letter/k/e99b99/32.png) [@Kade\_Gibson](https://community.cartalk.com/u/Kade_Gibson)\ **Post date:** [April 29, 2019, 4:07pm UTC](https://community.cartalk.com/t/trouble-shoot-chevy-truck/139475/3 "2019-04-29T16:07:07Z")
My fiance works for Orilleys so I get a good discount but we are on a limited budget. Think it would be acceptable to clean the old IAC with carb cleaner to see if that helps? I’ve heard it doesnt help but if I can save money it’s much preferred ---
**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:** [April 29, 2019, 4:12pm UTC](https://community.cartalk.com/t/trouble-shoot-chevy-truck/139475/4 "2019-04-29T16:12:43Z")
Cleaning only works if the vehicle stalls because the IAC valve/throttle body is dirty. When the IAC valve hunts for the proper idle position, it usually means the IAC valve is defective. Tester ---
**Author:** ![Kade\_Gibson](https://avatars.discourse-cdn.com/v4/letter/k/e99b99/32.png) [@Kade\_Gibson](https://community.cartalk.com/u/Kade_Gibson)\ **Post date:** [April 29, 2019, 4:16pm UTC](https://community.cartalk.com/t/trouble-shoot-chevy-truck/139475/5 "2019-04-29T16:16:45Z")
Well I guess its worth a try then. Worst case I have to go use her discount. Thank you very much, hopefully it is just the IAC ---
**Author:** ![TXdealer](https://avatars.discourse-cdn.com/v4/letter/t/50afbb/32.png) [@TXdealer](https://community.cartalk.com/u/TXdealer)\ **Post date:** [April 29, 2019, 8:48pm UTC](https://community.cartalk.com/t/trouble-shoot-chevy-truck/139475/6 "2019-04-29T20:48:34Z")
I don’t remember the specifics, but I seem to remember a lot of drivability issues on these trucks being a faulty coolant temperature sensor. You might try and disconnect it and see if the issue goes away.