so my truck has been idling rough on cold starts here in nj the past few days but seems to clear up when warm. then the other day I noticed it was kinda down on power and getting a shake at like 1500rpm but clears up with higher rpm. I went into the diagnostic on the edge insight and saw a code for cylinder 5 contribution but never got a check engine light. the truck had 190k on it and I don't know the history of the injectors so I'm bringing it to my shop to do a full test with the scanner. my question is if the injector is bad I'm just gonna replace them all and was looking at the 155cc ones, can I run those with the stock tune or will it be an issue? also side question, someone told me that the edge gauge would prevent the check engine light from coming on even if there's codes, is that true?