After dealing with the misfire issue for the past few months I have concluded that these coils are failing at high RPM. You get what you pay for and these coils piqued my interest in gray hair to see what could be wrong. After replacing coil #4 with a USED coil from the junkyard, I now have a misfire on cylinder #1. Apparently #4 was the worst, now #1, only 3 left to change ;-) How much have these coils cost me in mileage?
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