On/off high idle when stopped but vehicle is running. What can be causing it? on 2000 Ford Explorer

I have replaced the following: IAC, upper intake manifold, fuel filter, air filter, PCV, and mass air flow sensor.

by in Appleton, WI on February 05, 2013
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1 answer
ANSWER by , February 05, 2013
do you have any eng codes or can you watch fuel trim?