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Answered 2006-10-23 01:00:27

Perhaps a vacuum leak, or clogged throttle body. Perhaps just a worn out engine. When you replaced your idle air control valve, did you remove the battery for at least 10 minutes? It will reset the computer, then start the car up with all the accessories on, let it idle for about 5 minutes. It should relearn how to idle. Perhaps that will help.

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