High idle.
#5
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Join Date: May 2010
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Year: 1999
Model: Grand Cherokee
Engine: 4.7L V8
Try the throttle position sensor. My idle went down from ~2k to 500 rpm. $30 and 5 minutes and done. My did give symptoms at highway speed though. On cruise at ~65-70 it would revv up like it had dropped down into overdrive eventhough it hadn't.
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