Question about Ford F-150

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My 98 ford f150 makes a poping noise and sputters and misfires when I rev it up passed 3grand or give it too much gas in any gear. sounds like a lawn mower and won't pick up speed. I can tell the power is there . but only when I'm driving it. Idles fine and revs fine in park. Just when I'm driving. Had a tune up msd coil packs are a few yrs. Old... new fuel pump and filter. No check engine light or codes on the scanner. Please help!!!

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This may mean a number of things, it could be a bad distributor cap, rotor and wires, or the intake valve or valves are burnt. Buy a compression tester and test the cylinder compression they all should be no les than 100 psi or the the engine needs a valve job, especially if one is down to 50 psi and the rest are at 130 - 150 psi.

Posted on Jul 25, 2009

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