whoop ass racing

Ok so I recently had my truck retuned for a nitrous set up, I put the new tune on along with the nitrous plate and all of the rest of the kit. All of a sudden I'm getting two codes P0171 and P0174, I clear the codes and a few miles down the road they come back on. I tried getting a hold of Nelson Performance and explain the problem and they says I might have some kind of vacume leak around my nitrous plate so sprayed some break cleaner around the area and my idle don't seem to change. So I decided to take it down to the strip anyway, it ran pretty impressive but while at the track I get another code P0102 I had doughts about it being my mass air flow sensor with the first two codes but does this new code mean I do have a faulty MAFS?
Please any help is appreciated thanks!!!

whoop ass racing

So nobody has had this problem before ?

4.85spd

i still have the p0171 and p0174. hope a tune will help to fix mine. i have a lS2 intake and 90 mm tb

turboal1

those 90mm tb's usually throw lean codes. is it from a LS3 ?

4.85spd

mine is from 6.0 GTO i think. its the electric tb

turboal1

I think that's an 87mm T/B. do you have a cai ? check all the clamps.