coil clean, tests out good...new plugs, wires...head gaskets done...no coolant level issues or smoke issues. Now just a tiny little sputter...every once in a great while.... went off came back on this am.... seems like @ thruway speeds the mis fire happens...because I dont feel it at all. cel comes on...on the thruway?!!! who knows right now...its driving me insane. Only cyl. 3 or 4.... maybe coil when hot...shorts ? I dont know