The tenth generation Ford F-Series is a line of pickup trucks that was produced by Ford Motor Company, it was sold from the 1997 to the 2004 model years.

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RPM varies while driving

While driving at 60 mph the engine rpm will jump up a couple hundred rpm then drop back down. It will do that constantly. What might be causing it?

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Hit the overdrive off button on the gear selector and drive. Does it still do it?

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Chosen Solution

It could be your IAC (Intake Air Controller) that is stuck in the open position which could explain the RPM's jumping around. Try removing it and spray cleaning it and then reinstalling. Make sure however that it is moving freely after the cleaning otherwise the issue will still be present.

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