I have a 2011 6.6 lml with a very aggrivating issue. Its bogging down like no air flow emits grey white smoke n wont go, in neutral and park throttle respond normal but tryin to drive sometime will ....chke out i guess.. Im a FNG to owning a diesel have had truck for 2 yrs and oly a glow plug issue once. Took to a dealership and they said the balance rates were off i need new injectors. Dont have 8k sitting around burning hole in my pocket. So went with injector cleaning and drove fine for 2 days round town and to work 2hrs round trip, and leavin for work faltered again....got my scan tool out and pulled balance rates up had inj 6 at 5.4 the rest were +to - .1 or close to it. No trouble codes at all during this but when i recive truck back from dealer had a bunch of dtc from inj? Guess they didnt clear. Have had fuel cilter changed prior to dealership. Im a multicraft maintenance tech so not stupid but dont know where to head from here. Read about the cp4.2 pumps which i hope it isnt, also about the frps? Could this be possiblity. Have egr/def/nox/scr electroniclly deleted before i bought didnt relize at the time.