Question about a 1998 Ford Explorer??

Question:
Sometimes when the vehicle is idling it will rev up really high, if i put the car in drive or reverse it will stop doing it, it doesn't do it all the time just sometimes, and only does it when in Park. What is it, does anyone know??

Answers:

Car Body Shops in Missouri?

could be your Idle Air Control Valve (IAC) they are known to stick / Very easy to replace, 2 bolts on top of intake near throttle.

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throttle positioning sensor.....

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Is the engine getting hot? The vehicle may have an idle sensor that automatically increases engine speed when the engine temperature is too high.This causes coolant to circulate faster and cool it down.

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