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  1. Began misfiring on the highway (not a standard spark plug thread)...

    E39 M5 and E52 Z8 Discussion
    So I hit a new-to-me problem with my M5 today. 2-3 months ago, the car started misfiring on the highway. Pulled the codes and got the standard misfire codes for a specific cylinder. Replaced the plugs and the coil on that cylinder (82K miles). The car has been fine since -- I did the thermostat...
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