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I have a 1990 Ford 460 with a 5 speed, last week on the way home it started to run rough and within 2 minutes it quit, I changed the computer located on the drivers side inner fender, still wouldn't start, towed it home, got a distributor module, had machine shop press gear off install module, removed #1 plug put my finger over hole, bumped motor until air pusher my finger from hole, timing mark was about 14 degrees advanced, reinstalled plug, motor still runs a bit rough and if I go over 2000 rpm"s it back fires when I let off to shift, I also replaced wires, plugs, distributor cap, rotor button, and the coil and it still backfires when I let off. I even put the original brain back in and it runs better with that one but the problem persists, I am out of ideas your, help would be greatly appreciated. Dennis
 
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