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Lol, got a few random codes from my truck just after rinsing off some coolant on the passengers side that I had spilled while doing the water pump. I basically got a cylinder 4 misfire (which I could hear happening) and a control circuit code related to that injector along with a P0090 regulator code. All came at the same time.

Took a look at the injector harness where it's ziptied to the alternator and sure enough there's copper staring back at me. Wore right through the loom and the insulation. I was a bit freaked for a minute before I saw that and relaized I had gotten it a bit wet and that's what caused it all. Hopefully this will help someone else.
 
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