Question about 2001 Ford Expedition
Do you have a check engine light? If so I'm betting air flow insufficient, This is cause by a vacuum hose that is either deteriated or has a hole. Run you hands over the vacuum hoses any of them that turns your hand black like playing with charcole replace them.
There is a process used by your local shops where they put a smoke machine to look for leaks.
That is the best place to start without changing the idle air control valve $$$$
Posted on Nov 02, 2010
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Posted on Jan 02, 2017
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