I've had trouble with the Ignition Control Module on those cars. It's mounted under the coil pack. This module also controls the tachometer. Not a sure thing but a possibility. If changing the IAC solenoid or simply cleaning it helped temporarily, perhaps there is a bad connection at the solenoid and agitating it makes contact until you drive it some and then it acts up again. Try wiggling the wires at the solenoid and see if that changes the way it runs at all. Be sure to check it with it running. If not, repost and we'll try something else.
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Wednesday, December 24th, 2008 AT 5:53 PM