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Is the battery good? I had intermittent misfires on my wife's Cadillac SRX with coil packs. Replaced all spark plugs and coil pack in question, still had a misfire and CEL at WOT. Battery had been weak the entire time, finally died. Now with a replacement battery, there's no more issue. Just a suggestion, I know the battery never crossed my mind as the issue.
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‘07 Mazda RX8
Past: 911T, 911SC, Carrera, 951s, 955, 996s, 987s, 986s, 997s, BMW 5x, C36, C63, XJR, S8, Maserati Coupe, GT500, etc
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