My plugs keep crapping out
My spark plugs only seem to last about 500 miles then they start misfiring when i use high boost at high rpm. I have tried cleaning the plugs but only a new set cures the missfires. The plugs are the normal coffee colour and look perfect and are ngk bpr7e's. I can't hear any sign of detonation. Any help apreciated it's getting expensive!
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