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coil trouble?

  1. 2003 Mustang gt Miss Firing when under load

    4.6L Tech
    I recently pulled out my 2003 mustang gt for the summer. Since i pulled it out it has been missing and backfiring when under load. If i idle around town you can hear the miss still. but still idles half decent. Engine was just rebuilt begining of summer last year. Intake and throttle body has...