i just put a drag gen 3 kit on my ls and am running 6 psi. i was gettin the sputtering but it was because of to much fuel i think. i kept changing the disc in the fmu smaller each time and i finally unplugged it and it went away. i'm running the holly forced induction pump with msd 395cc injectors. i also have the cometic (sp) headgasket. once i get it tuned better at 6 psi, i plan on installing the headgasket and running 10 psi. my only problem is my map sensor was working before i put the missing link on, but once i installed the missing link, the pressure reads steady -760 on the s-afc. anyone have any ideas?