Bought this truck used about 2 years ago. Changed plugs and plug wires do to an engine miss and all was good. Year later miss came back, engine code " mis fire no 4 cylinder". Changed plug, miss corrected. Year later same thing. Had to replace only No 4 plug to correct engine miss.
Any idea what could be causing this. Plug looks good when I pull it. Doesn't look fouled.
have the same problem?
Thursday, May 21st, 2009 AT 9:03 AM