My 1997 Ford F150 is misfiring. I've replaced the spark plug on cylinder 6 to attempt a fix (it needed replacing anyway), but it did not work. It only misfires about half the time. It will run normally, then misfire, then run normally. Only misfires under engine load or at 55 mph around 1500-1700 rpm. Any idea as to the problem?
Sunday, October 14th, 2012 AT 7:30 PM