Sounds like everybody's favorite P2262 code. Cleaning the turbo/egr and a forced regen should put things back to normal.
The only thing my truck has ever been in the shop for repair wise has been emissions related. I haven't even gotten any codes since a few select parts "fell" off. Not to metion both power and mileage are way up.

 

i would love for a few selected parts to fall off. i don't know which direction to go. i have seen the h&s kits & heard some good things about it,but what is this that lukes diesel is talking about. i already put the dpf back straight pipe(waste of money). i just would like to have something that is trouble free because i know when i do this warranty is gone.