Tony, Coil #4 is brand new. Both POS are brand new. I swapped injectors (cyl. 4 to cyl. 5 and 5 to 4) to confirm it wasn't fuel injector related. Swapped known good ECU, no help. Physically traced the ignition wires and fuel injector wires by cutting open the harness all the way to the ECU, everything checked OK. Jim