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car not running great, intermitten misfire, intermitten rough idle. The plugs have maybe 2k on them, and they were all gapped at .035, looked fine when I pulled them as far as not being wet, not being fouled, no excessive carbon buildup or blistering. However the number 6, and number 5 to a lesser degree were stained orange on the white part (outside the cylinder) it looked like it could have either been cooked on oil, or just burnt porcelain, I couldn't tell but none of the other plugs had it. I'm sure it's been seen before but what is it? Did compression test at the same time, all 6 were 145-155, think my head gasket is fine (no low cylinders and it was replaced 2k ago as well) I'm pretty sure some of my 19 year old injectors are going, it's just too much of a PITA to ohm test them still in the car.
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