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Is it the trany or speed control senor the cars rpms go up to 4000 and races

(1997 Ford Expedition)
in Staten Island, NY on December 10, 2012
when driving but comes back down when you hit the peddle
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Popular Answer
of Greg's Orange Auto on December 10, 2012
sounds like idle air control or poss vaccum leak. do you have a ck eng light on?
on December 10, 2012
possible IAC issue
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