I would check the 10 pin connector. If your car hasn't been back to ford for the 10 pin connector recall I would bring it in. Its the black and white connector behind the intake. Ford made one side of the connector round, and the other side oval shaped. It results in a loose connection making for an idle problem similar to what you described. The jumper wire assembly takes car of that.
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NewEngland Auto www.baystategearheads.com
-91 Mustang Coupe, ex 4cyl (sold)
-99 F150, 3" lift, 35" Procomps, Magnaflow exhaust
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