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08 Road Star 1700
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I could maybe see it happening if atmospheric conditions were right. Or if it is a old plug it could be carbon tracking. You have upwards of 40,000 volts looking for someplace to go. Most coil packs switch polarity it driving two plugs. I am not sure I would let it go to many times without a ground. It could cause trouble by not allowing the circuit to complete.
 
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