I tried tuning a truck today and i didnt get any good results. Disabled the maf and logged the stft and ltft. Then i plugged all the values into the EQ_VE program and made a VE table from that. Copied the ltft histogram and did a "paste special-multiply by percent" and made equations out of it again and pasted the results in hp tuners again and wrote to the pcm. Here is the tutorial i used to do this all: http://www.camaro5.com/forums/showthread.php?t=196696 and ill attach the tune and a log.
07 silverado vortec max
stock l76
long tube headers and full exhaust
high flow intake tube and filter