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Did you change anything before the issue started? Is it happening on and off wmi? What mix are you running? I have an Audi ttrs with a big turbo and 1000cc wmi. Had pretty good misfire when running stock plug gap. Dropping it from .035 to .025 fixed it. Not sure if this is applicable given its happening on the same 3 cylinders for you but figured I'd mention it.
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2017 2SS A8 TSP LT's, ported msd/95 mm, e85
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