Question about 1991 Ford F250
You can find the miss by starting the engine and pulling one plug at a time. when you find the one that doesn't change how the engine runs, there is your problem area. things to do are, first I would switch the wire and see if the miss goes away. If it doesn't then pull the plug and see if it is fouled out. do a compression test on that cylinder. if the compressionis low you can spray some wd40 in the cylinder and retest. if the pressure comes up then the rings are bad, if it doesn't then you have a valve problem.let me know
Posted on Nov 15, 2010
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Posted on Jan 02, 2017
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