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For what is worth. I've had problems with P0351 (coilpack cylinder 1) for the last 2 years. My car is NA and on gas really not an apples to apples problem, but when the code would show up it would iddle like crap. Last time I changed the coil, I decided to look at the plugs, my plug on cylinder 1 looked like yours, while the rest were not as black. After the last time I changed it, I had a problem with the vtt sensor (P0016). It was only the sensor, and swapping to a new one fixed the issue. But another coilpack has gone by since that. It looks to me like something isnt right somewhere else and the consequence (not the cause) is the coilpack failing, or the vt sensor failing as well, both could result from extra heat on cylinder 1. I do not know the source of my problems, I cant really diagnose it since changing the coilpack seems to magically fix everything, so I think Im stuck with it.
I saw somewhere that there is a very recent service bulletin for 2013-2014 cars to change out their wirning harness and coilpacks to the newer version (2015-2016) because there is an issue where they get loose and cut connection. I think your next logical step is to disconnect the coilpack and mesure the voltage, current and resistance of everything in between the ECU and the coilpack itself, including connectors and wires. It could be as simple as a burnt wire not transmitting an stable signal. I didnt see any post about you testing connections (altho I skimmed over your thread rather quickly), so maybe try that next since its easy.
Good luck on your search.
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