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Q: engine revs to 2500 rpms after driving for 20-30 minutes on 2000 Ford Windstar

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
normally the car stays at 1500 rpms, but van will not stay there once engine is hot. It will not come back to normal until next day and engine has had time to cool completely. Please let me know the repair to make.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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You may well have a sticking idle air control valve (IACV) , possibly due to "dirt" accumulated in it's moving parts.
I have been able to clean them as a fix in lieu of replacement.
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