Regardless, don't overlook the simple stuff in favor of the less-common stuff. I would start with new plugs, wires, and cap and rotor. We never like throwing random parts at a problem, but in this case those are less expensive than a trip to the mechanic. If those parts don't solve the problem, the next suspects are injectors and perhaps worn lobes on the camshaft.
'96 and newer cars should set a diagnostic fault code indicating which cylinder is misfiring. Then you can switch the injector from that cylinder with one from a different cylinder to see if the misfire moves to the different cylinder. If it does, you know the injector is the cause. That would not be real common.
Friday, September 26th, 2014 AT 7:03 PM