My 97 truck has serious problems pulling any load at interstate speed. Like my 24 ft trailer with a 45 hp John Deere, I could barely get 65. Loads my old 6.9 with no turbo laughs at like its not there. Going up a hill, if you lock the overdrive out, it loses speed, with over drive out it will only pull about 60 mph, and it blows a lot of blue smoke. If the truck is in park and you mash it all the way to the floor, it revs to about 2500, hesitates there for about 3 seconds, then slowly builds to 3500, while blowing lots of blue smoke. I thought it was the fuel pump, I replaced that today, seemed to help a little, but not much and it still doesn't pull very good.

 

I am having the same thing- just replaced fuel pump and R&R'd the fuel bowl. Did not have surges or no power -no acceleration after replacing the pump. just started after R&R of the fuel bowl.

 

Sounds like the injector o-rings to me.... classic smyptoms.

 

Ok, how do you fix that, I take it its not as easy as on a 6.9. Nothing is, I put a $25 fuel pump on in ten minutes on a 6.9, now its a $110 pump and it take 3.5 hours.

 

Do a search on injector o-rings. You will find a slug of threads.

 

I did a search but I couldn't find anything about how to put them in, only confirmed I probably need them.

 

andy. you can clean your fpr screen and it should get you by. but yes its probly your injector orings given the blue smoke. heres a good write up on removal and install.
injector removal and install