There is a trigger wire that goes from the ign module down to the 7x sensor. It is a twisted 2 wire connection. With exposure to heat back there the wire will sometimes fuse and skew the signal sent to the module to start the firing order of the coils. I would replace that lead, I bet it solves the poblem as this is a very common issue
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A SS looks like it could kick your ass if it wanted to, but a WS6 looks like it's coming over to do it
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