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

(2000 Ford Explorer)
in Appleton, WI on February 05, 2013
I have replaced the following: IAC, upper intake manifold, fuel filter, air filter, PCV, and mass air flow sensor.
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Popular Answer
of Greg's Orange Auto on February 05, 2013
do you have any eng codes or can you watch fuel trim?
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