OK got a 05 cummins the smarty is off it and the quad boost fool er. the only thing that is in it is the stage 3 injectors and the turbo. the truck ran fine last night now all of the sudden its like its in limp mode doesn't want to accelerate at all my egts are really high. the fass pump seams to run longer the usual when i turn the key on with out starting it. i just replaced the map sensor a few weeks ago. any help would be appreciated. thank you

 

Just a guess, but have you checked your rail pressure relief valve? I wouldn't be surprised if it were leaking. This sounds like the same symptoms I had on my '05.
mishkaya

 

You've got a Smarty, check for codes, maybe that will shed a little light.

 

no codes thrown and were is the pressure relief valve

 

It's on top of the rail. There will be a line with a banjo fitting, underneath that!!

 

thank you going to look at it right now I'll let ya guys know

 

no leaking at all but i am going to go check the ac wire thing that every one is talking about.

 

You probably won't see any leaks as it returns fuel directly to the tank if I recall correctly. If you have a rail pressure gauge you will know, or if you cap it and the symptoms go away you will also know.
mishkaya