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1999 Ford F-150 Question: rpms up speed goes down on acceleration



, 5.4L V8, Delight, AR, June 12, 2010, 09:00

4r70w transmission, fluid good, filter changed. Rpm's go up when engaging passing gear, and speed falls off. I have to let off pedal until rpms fall to 1500, then start again slowly. I've had this problem for 6 months. truck drives fine unless trying to pass. No codes on scan.

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