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Sorry this is a long post but I’m lost here and any help is appreciated. I’ve been searching google for a while now and this is my last resort, I got a 2016 Colorado duramax with 79,700 miles at the moment, and I got a CEL 2 weeks ago but truck was running fine. Checked codes and came back with P0269, which is cylinder 3 misbalance. So I figured it was fuel injector related. Well after running injector cleaner through it and clearing the code it came on the next day with the same code, and also p0263 Cylinder 1 misbalance. Took it to the dealer and they said fuel injector 3 needs to be replaced, they wouldn’t even look into if it was an electrical problem or a chaffing engine harness, they just said $900 for the new injector. On the way home from the dealer my stabilitrak service light and traction control light came on. I changed my fuel filters as they were pure black and the codes went away instantly upon restarting the truck. Well fast forward 300 miles, yesterday while driving P0263 came on, I cleared it, and about 50 miles later P0269 came on. It does have a weird idle when it’s cold but once it’s warm it idles fine. My question is if anyone has had similar problems or if anyone has any suggestions. Thanks for any help, and I posted this in the other forum so sorry if you see it there as well