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A few weeks ago my ignition coil went bad, it was arcing out of the top and off the sides to the bands that go around it. I replaced the coil and it ran fine for a week now the sprks are flying again, through driving speed it miss fires because all of the spark is arcing to the body. Could it be distribtor cap, wires, plugs, distributor, tfi module, hall sensor?
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My coil. an MSD unit, suddenly has a very bright "halo" right after the car started running poorly. My engine was misfiring, underload\acceleration, more\worse as the engine warmed up. My mechanic blamed the Tfi module & replaced it. The corona or halo disappeared after the repair work was completed. I'm not saying it would fix you're situation......just relaying a similar circumstance.
 
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