2005 E450 Ford V10 intermittent misfires
My 2005 class C is built on a 2004 frame with the Ford V10 in it. It has developed an intermittent misfire this year but not enough to give a CEL. Google searches tells me that it probably needs...
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More likely it’s the coil pak rather then the spark plugs. If you put a code reader on it it will tell you how many misfires there are on each cylinder. I’ll bet one or two of them has an exceptionally high number of misfires compared to the others.
