You most likely have a vacuum leak somewhere, vacuum line, brake booster, intake manifold gasket, fuel injector O-ring.
If you put the car in diagnostic mode (jump terminals A and B of the ALDL), this should move the IAC to the fully closed position (you should hear it buzzing).
If not then the IAC may be bad.
But the IAC is designed to control the idle within a range of about 700 rpm, so I still think you have a vacuum leak somewhere.
Sunday, October 26th, 2008 AT 8:18 AM