Personally, I'd be inclined to inspect the connection on the coil pack for the indicated misfiring cylinder. Secondly, I'd probably just replace that unit just to be sure.
I don't know the internal wiring forthese particular units, but certain designs use the mounting bolt for the ground. I...
I agree most of those probably aren't legit. I've had similar experience when the CAN bus was having issues. It started from a sunroof water leak submerging some grounding lugs, then leading to a failed soldier joint on the chip on the back of the IPC. Due to the timing of the problem, I'd guess...
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