just a couple of points. you said its pouring white smoke out the exhaust?
white smoke = water in combustion chamber/exhaust
ie if what everyone was saying about too much fuel then smoke would be black.

white smoke = water
blue smoke = oil
black smoke = too rich fuel

plus the misfire could be coolant in combustion chamber.

just do a combustion leak test and check the turbo as easy to check. ive been a mechanic for 15 years so im not just guessing.
hope that helps, cheers gary.