I have a 1996 3.3l MFI plymouth grand voyager se with 171988 miles on it. i have been getting a trouble code of p0300 multiple misifre code every now and then and it mainly occurs when at highway speeds or i have to put the pedal to the metal for the most part all the engine components are stock that i know of other then spark plugs and spark wires what do you think it could be ?
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