2007 cobalt ss e85 stalling

[GROUNDEDRACER]

I just bought a 07 cobalt ss supercharged coupe from a private seller.

It has a aftermarket supercharger l 80lb injectors and on e85

He claims to have had a dyno tune I will upload the file

it surges non stop at idle
and stalls when ever you let off the gas

[TCSS07]

whats the full mod list for the vehicle - fuel system mods besides injectors, throttle body swap, cammed, intake...???

[GROUNDEDRACER]

harrop blow
80 lbs injectors
e85
return fuel system with boost reference
zzp 3 inch cold air intake
header no cat 3 inch exhaust
dual pass with plan b
zzp heat echanger
2.7 pulley
30k miles
ls4 t-body
ported intake manifold
stock cams

[TCSS07]

change the etc scaler to 4950 for the ls4 throttle body
those offsets are from SJSchafer for 60's - i use these from the injector spreadsheet - Attachment 86062 (omega and 04redline) - i use those and they have worked well for me - i don't use the short pulse adders btw
rpm limit is pretty high if you don't have valve springs imo - unless you have it set to that just so you don't hit the limiter
20* idle spark? seems excessive to me but ive haven't tuned a e-85 car so maybe you need it that high but also if you have too much ign timing that could cause issues also - factory is set at 10*