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Re: HIgh rev idle and bucking at high revs
remove and clean your IAC valve.
Rest your computer by pulling the negative battery cable after for 5 minutes.
Reattach and then start the engine, it will start a little rough but it will relearn its idle. Idle it in park for 2 minutes and then idle it with it in gear for two minutes standing still with the brakes on.
Should fix it.
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