when i am at about 2500 rpm and if i keep it steady there, my inj duty goes up and down 3% over and over, and you can feel it, it is like someone is very lightly tapping on the brakes. This is in all gears. When i hit the gas though it goes away, and i can still go all out and it seems fine. any ideas?

 

closed loop perhaps?

 

You can try adjusting the O2 feedback setting using the Datalogit. Even better, get a wideband and tune cruise areas so you can turn the O2 feedback function off.

 

i recently installed a supra fuel pump, could it have anything to do with that, like not enouch voltage or something?