no answered the previous question, i did change the injector, and ohm'ed out the injector wiring, the injector working as i swapped the with number five, and still having the P0304 issue with number four.
Swap out the spark plug between #4 & #5. Leave the plug wires as is for now. Make sure the plug threads are not damaged in the head. If you have access to a m/c shop you might want to run a tap down the threads to make sure the plug is fully seating. I`m thinking you have an electrical problem or the plug is losing your compression or the plug is cracked & arcing. Make sure No4 plug wire is not arcing or has a faulty connection at either end. This is a 3L Vulcan engine with EDIS (coil pack) right.
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