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    Ford engine revs high and stays there during shifts

    1990 f250 4x4, 5.0, 5 speed, revs to 2500 and stays during shifting. I have to turn engine off to stop it. On cranking, engine revs to about 1500 for 10-15 seconds, then drops to about 650 and will idle all day at that speed. Top mechanic at national name tire and auto service center ( a friend...
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