About a month ago it happened once or twice for just under a second and never happended again and now in the last week it is doing it more and more. It seems to happen around the 2000 rpm range. If I give it some gas it seems to stop it. It will happen when I am just cruising or decelerating but it seems to go away when I hit the gas. Most of the time gray smoke comes out the exhaust at the same time but at least one time when it was doing it for about 4 or 5 seconds straight, tons of white smoke was coming out. I am not getting any check engine lights or anything. Idle seems to be perfect. Oh yeah when it does it under deceleration it actualy acelerates and when I am cruising it seems to lose power or surge. Do I have bad fuel or a bad injector or what? It is a 2004 with only 1600 miles on it. It really sucks I hate to let people work on my stuff because in my experience most of them are idiots. I used to mechanic at a Nissan dealership but I don't have any diesel experience and but from what I hear most guys at the Chevy dealerships don't either. Anyone know of a dealership with a good diesel guy in southern California? I would be willing to do the work myself if the factory would give me the parts but I know that isn't going to happen. Also from what I have read, I will probably be out of a truck for a week or more. Do I get a free loaner car if my two month old $40,000 truck has to sit in the shop? Any insight would be greatly apreciated with regards to my problem or a good dealership or what the policy usualy is on a loaner car.