3.3l non-flex engine. Got a/p0302 code: changed all plugs and wires, and coil pack. All old plugs were near. 080, no fouling but badly worn. Car had been skipping a beat before check engine light came on. Removed neg batt cable during tune up, about four hours, to cleat PCM. CE light came back on after about 20 miles highway driving. P0302 code showed up again. Car idles at 1500 in neutral. Listened to #2 injector--it's clicking away like the others. Vacuum lines appear to be intact. Where do I go from here?