Had this problem on a couple of trucks now including my own. My truck is a 2006 LBZ Duramax, intake, exhaust, lift pump, built trans, etc... Anyways, occasionally when cruising and getting into the throttle the truck seems to stumble and hesitate to build boost, almost feels like a defueling, but it'll do it even on a basic tow tune with the lift pump on. It'll blow some smoke in the process, but all of a sudden the boost will shoot up and it'll be all good. Egr is disabled in tuning and all of the maps for it are at 0.0. I'm guessing this has something to do with the main cal on my dsp5 which is supposed to be about 530RWHP, because i doubt the same thing would be bad on all adjustable parts of programs 1-4. So what do you guys think? Where in my cal should I look for errors? I used to think the egr was sticking, but now that it's happened on multiple trucks including one with 46k miles I'm doubting that. All of the trucks have been LBZ's with the same DSP5, just specific to their OS's. Thoughts?