Auto Answers » View Question
Antoni ... 1/30/2013
2002 GMC Envoy SLT 6 Cyl 4.2L - Transmissions & Drivetrains
Why does my car stall when I come to a stop as I step on gas.
Happen when car is cold and warm
When come to a stop
Occur once in a while
Today 30/01/2013, is when it started
No check engine light on
No warning lights on
Once in a while when in park RPM goes low and back to place and look like it wants to stall
1 Answer
  • CVO
    CVO 1/30/2013
    Check the idle air control valve.

    The Idle Air Control (IAC) valve controls the engine idle speed and dashpot functions. The valve is located on the side of the throttle body. This valve allows the necessary amount of air, as determined by the Powertrain Control Module (PCM) and controlled by a duty cycle signal, to bypass the throttle plate in order to maintain the proper idle speed.

Preview Answer