Just replaced my plugs with BMW ones....getting a cylinder 5 misfire. Don't have my PROcede anymore so I'm just using a regular OBDII. Swapped back to the older plug and the car runs smoother, but at WOT is misfires again on cyl 5. Car ran perfect before I swapped plugs. Any ideas? Keep in mind...car ran perfect before I swapped plugs.
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