Do you have a check engine light and when was the last tune-up?
The idle air control valve targets the idle speed at all times whether the AC is On. The computer will raise the idle speed thru the IACV when it senses the AC load from the compressor or from an idle up solenoid
Try cleaning the IACV and test the EGR valve and the throttle position sensor
Tuesday, June 28th, 2011 AT 11:09 AM