my old 99 2500 2wd when i go to step on pedal sometimes it has now power at all it doesnt smoke or nothing just doesnt go and it doesnt always act like that i know i need new radiator put it shouldnt make truck act slow mt trans is good same thing with tc & injector pump any ideas whats wrong?

 

any codes? sounds like it could be in your apps

 

iv scanned it and had somelse check aint throwing any codes i cant find any boost leaks either

 

are you getting any boost? how is your turbo? does the compressor wheel turn smooth? is there excessive play in the shaft? how about any exhaust leak in front of your turbo?