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* Open or short in IGF or IGT circuit.
* Faulty ignition coil/ignitor.
* Faulty ECM.
Check ignition IGT signal from Engine Control Module (ECM) to ignition coil. If ignition IGT signal from ECM is defective, Diagnostic Trouble Code (DTC) P1300, P1305, P1310, P1315, P1320, P1325, P1330 or P1340 will be set in ECM memory to indicate a specified ignitor circuit malfunction. If ignition IGT signal is okay, substitute another ignition coil and recheck system operation. If ignition IGT signal is defective, check wiring between ECM and ignition coil. If wiring is defective, repair wiring as necessary and recheck system operation. If wiring is okay, substitute another ECM and recheck system operation.
I would look closely at the inside of the connection between the plug and coil pack. Look for corrosion. You will need a flashlight to really see what is going on. Pull the connectors apart and use Electrical safe Spray and clean the connectors out for Cylinders 2 and 3
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