Hey I know this is a long shot but I have a problem with my lb7 that I can't figure out the problem to I've researched alot and can't seem to find the problem so instead of taking my truck to the dealer I thought I'd reach out to you.... I haven't driven the truck in a while but I went to start it the other day and it was cranking and cranking but wouldn't start then I primed the fuel and it started then as I was driving it it seemed to be rolling alot more coal then its supposed to but it was black smoke coming out the exhaust not white or blue it was black. Then I got home and at idle it wasn't hazing or smoking at all but it was knocking pretty good sounded like the duramax tick but louder. Then I put it in drive and as soon as I would touch the gas it would instantly roll coal no matter how much throttle I put into it. But again when I put it in park no haze or anything then I shut it off and it won't start again just cranks over. I was thinking injectors maybe but normally injectors have a white haze at idle and idle rough when my truck wasn't at all. No engine codes or anything so that leads me to believe maybe it was a boost leak but would that affect it not wanting to start? Let me know please and thanks if you have any ideas on what the problem may be it would be greatly appreciated!