i have a 1988 f-250 c6 with a banks kit and the pump turned up. when its cold out side (under 40 or so) and the engine is cold, i let it warm up for 5-10 minutes then leave. when i get going and my rpms get up to about 2300-2500 somtimes it fells like i hit a shot of nos.it lays me back in my seat and goes, i only have my foot at mabye 1/2 throtle. whats it doing?

 

how many miles on your injector pump?? it sounds like your pump is getting ready to say by-by.

 

about 86,000 on mine i turned it up about 1000 miles ago. i dont think its about to die because its been doing it for over 3 years, ever since i got the truck. i have a friend with a brand new pump on a 85 6.9 (mabye 10,000 on pump/over haul) and it will do the same thing

 

I'd say your sucking some air into the pump. Must have a small leak in your fuel lines somewhere.

 

I vote air as well sounds like she purges out then you get full fuel with your turbo already spooled up.

 

Also if the cold advance is still on your IP timing is advanced.
You may just be seeing the power you could have with the timing set at 8.5 or 9 BTDC.