5.3 let me down..or maybe it was the tuner

[chvy=power]

at WOT there is no manifold vaccum so i dont see how that could be it..at WOT the lt and stft are both 0.0. just easin around town they run anywhere from -1 to -10. i took the screen out of the maf so maybe that threw the reading off?? As far as timing he said something about how the hp and tq curve were wavy at higher rpms meant that the timing was off. maybe that guy was an idiot? idk all this tuning stuff is new to me so i'm still learning. When you drive the truck it just makes a lot of noise at high rpms and dont go anywere, guess its starving for fuel? And are those hp numbers a little low? if i cant put down more than 300 to the rear tires then thats just sad......

[farmtruc]

at WOT there is no manifold vaccum so i dont see how that could be it..at WOT the lt and stft are both 0.0. just easin around town they run anywhere from -1 to -10. i took the screen out of the maf so maybe that threw the reading off?? As far as timing he said something about how the hp and tq curve were wavy at higher rpms meant that the timing was off. maybe that guy was an idiot? idk all this tuning stuff is new to me so i'm still learning. When you drive the truck it just makes a lot of noise at high rpms and dont go anywere, guess its starving for fuel? And are those hp numbers a little low? if i cant put down more than 300 to the rear tires then thats just sad......

How was map/vac measured at wot?
The 0 ltrims are correct at wot. If the ltrims are negative before PE mode, then they will go to zero, which is what you want.
Be sure the maf wasn't damaged in any way when the screen was removed. It sound odd, but the position/clocking of a maf will cause a lean or rich condition as well, but not in this case, just mentioning it.

The graph doesn't look bad to me, has a nice curve to it. It's a bit shaky, but that doesn't or have anything to do with timing.
Maybe his pick up or probe or however they measure rpm had some interference.
You won't see those tiny spikes like that because timing is off.

If a/f ratio is dead on, i don't think 300hp is reachable. You're asking for 40hp or so.

See if you can get some realtime data sent over, maybe someone has hptuners and can send over a scan.