Does anyone know if using the wrong spark plugs would cause a misfire? My local mechanic put in the AGSF-32-FM and they worked for a while but now i am getting a backfire. New wires and replaced coils. Now i am finding out the CNG needs AGSF-22FM1-F4. Would those other plugs make that much of a difference or should i be looking for another reason for the misfire ??
thanks
thanks
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