Somy truck has been having this "stumble" problem when shifting to o/d. I thought it was enginge related but now I'm thinking Turbo. Driving to work this morning I watched my Turbo gauge and noticed when the ole girl shifts to o/d the turbo dumps about 2lbs, stumbles, dumps one lb, stumbles, then dumps the rest. I was under very light throttle and was pushing 6-8lbs of boost. It is e99 so it has a WW already. Any ideas?