I have 2000 GMC 1500 5.3 litre Engine, in very cold weather starts fine, runs for few seconds than engine wants to stall than engine revs up for few seconds tahn again wants to stall, at time it will stall. Start the engine again runs for few seconds reveving up & down than runs fine after 40-50 seconds, anyone knows what this could be ??
Could be a bad IAC (Idle Air Control) valve on the throttle body. Or the throttle body may be dirty. HTH. -Jim
I agree with Jim. Check your iac.
Ok guys I have a 2000 GMC Sierra z71 . It has a small vibration in the cab of the truck when idling. Only does it after the engine is ran and got warm. If u have drove like 10 miles or so at around 65 mph and stop at a red light it will idle fine rpm around 900-1000 it will idle fine for a few seconds then it will vibrate a tad not much Rpms still at 900- 1000 Truck runs fine like a brand new one but I was jw if this is normal. Truck has standar exhaust
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