2003 120k When under heavy load, all of a sudden it seems like the engine is dying, I back off of it a bit and then poof, a big puff of white smoke comes out of the exhaust and it will continue running, although it will buck for a bit. I have changed all the filters, what do I do next???

 

i would say by reading all the other posts similar to this u might want to get your injection pump looked at jared