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Truck had been misfiring on cylinder 6, I pulled the plug and it had what seemed to be burnt oil all over it. Not sure of the cause. Pulled the plug next door to it and seemed to be just fine. I re-gapped the plug as it was a little bigger than what I had read as the norm. the truck ran fine after that. Would could be the cause of the plug looking like that? Could it have been due to it not being gapped correctly and arching off? Is it just carbon build up due to a non-running spark plug?
3.0 V6 - 5 Speed
thanks for any input given. This is the 6th cylinder spark plug that was misfiring before re-gapping.