I just bought a 94 Z28

Its got:
Vortech V1 S-Trim Supercharger
9spi Pulley
Vortech Fuel Regulator
T-Rex electric external pump
STOCK INJECTORS

Problem:
When i give it like everything but full throttle its fine, but when i floor it it stumbles like its choking

I do not have a computer tune, Sometimes the car stalls at a light

Stock injectors


What do u think the problem is ?????????

 

I would get a rebuild kit for the FMU and check the spark plugs for heat range and what they are gapped at.

J

 

Get/borrow a scanner tool and look at your knock sensor readings; the knock sensor may be pulling timing causing your stumble.

 

I agree with the above post. It could also be breakup from low fp,
might want to add a turn to the fmu and see if the stumble changes.

The death at the light could be many things, again if it was working fine before it would not apply. But a 9lb pully could be throwing your maf off. Depends if it's on the hi side or low had some issues in this area myself.

good luck.. with the blown Z

 

I have a procharger in my car and I had a similar problem, It turned out to be the hose on the intake side was collapsing causing a restriction. You should also check you air filter to see if it is not clogged.