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Believe it was #3 where it was mentioned there were misfires so blackish plugs would make sense in that aspect. What is causing the misfires though I think is the issue.
Can't remember, but did you try swapping coils from bank 1 to bank 2 to see if the misfires follow?
Offer to do a zoom to look through duramtric still stands. With a cold engine here is what I would capture:
rpm
oil temp
misfire cylinder 1-6
Do it with a cold engine, let it get up to temp, then export to a CSV file and link to it here.
What I noticed at one point with mine is that misfires would happen once the SAE turns off and then rpm's would fluctuate. the data from durametric is easy enough to graph out in Excel too so putting charts to things can help visualize things.
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2000 Boxster Tiptronic
2003 Boxster
2003 996 C2 Cab
2002 996 (SOLD)
1986 944 (gone but missed)
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