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  1. M

    hesitatinon and stalling

    I have a 1991 ford explorer 4wd,at,4.0v6.The truck will be running fine at highway speeds and all of a sudden the tach. will jump from about 1700 to 2000 rpm.The engine will begin to ping.If I have to drive a long stretch, the problem corrects itself,but if I have to stop while the truck is...
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