I have a 2002 Duramax, with an Edge Chip, and four inch exhaust. I pulled my fifth wheel out of storage and pulled it to my house. When I got to my house and the truck was idling I noticed it was smoking pretty good. When I checked the injector rates I didn't have anything more then a +2 balance rate on one injector and the rest was less then + or - 1. So, my question is whats causing the truck to smoke and should I be worried?