Running bad

[cummins king]

The last couple of day the truck has been running weird.
As soon as i get on the pettle, and try and biuld a bit of boost the etgs go way out of control, and the turbos lag badly. I can only hit 25 maby 30 psi witch is half of what i was doing before and the etgs are at 1600+ ,and i didnt make any changes. Its blowing alot of back smoke, more then before, and maby abit of white smoke just before the black smoke.

Before i could hit 50 pounds, and not even break 1250d.
now it 25 - 30 pounds and 1600+.

Any thoughts?

Joel