Switch coil pack with another cylinder. If problem follows coil pack switch, there's your answer. If not, check continuity from #1 FI connector ground wire to ECU blue connector pin (color coded). If continuity exists wire is good. Probably weak/ bad ECU driver. Now knowing which is ground wire from above continuity test. Splice,or just bare the wire (as in temporary !!), and attach small alligator clip jumper wire from #1 ground wire before connector to easiest adjacent cylinder FI ground wire before connector,probably #2 or 4. Plug both FI connectors back in. If problem solved, ECU driver.
