02's could be a problem, and so could the ECT(engine coolant temp) sensor. May want to test fuel pressure, not so much the relay..
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Get a can of spray Throttle body cleaner, start the car and spray around, pay attention to vacuum lines and manifold, if the idle changes, you found a leak. You want the engine running and spray on the outside but do direct the stream onto the hoses, if it is a vacuum leak, the engine idle will change speed, then you have detected a leak, repair the vacuum leak and see how it runs!
Keep the spray away from the exhuast manifolds...
The other possibilty is the idle air control, it,s bolted to the side of the throttle body...
Thursday, February 4th, 2010 AT 6:48 PM