4A-GE MK1 Engine Rough engine idle and strange residue on spark plug [Archive] - Toyota MR2 Message Board

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My engine has been idling roughly for the past weeks. I decided to change the spark plugs as the first step. It looked like a lot of oil had gotten into the spark plug wells over the years, so I cleaned all that out. All the cylinders had a spark, except the 3rd cylinder didn