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Antoniopaduano

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.

123000km
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.

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