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Misfires and back 3 plugs quite a bit blacker than front 3 [ plugs 3000 miles old]

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Pulled the plugs after the misfires coming back up from the Med last month and the back 3 are noticeably blacker than the front 3.

Oxygen sensor maybe? Going to order some iridium plugs and see if that helps. Anything else to look at?

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