this is actually for my brothers car which we have not been able to get running correctly.
the car is a 94 Z28 with the LT1.

the car was bone stock up until about two months ago, and my brother is the first owner, then we encountered a problem withthe optispark. and, decided to replace with a GM high performance optispark from summit.
while the car was under construction we also added:

a LT4 HOTCAM kit(.525lift,1:6 roller rockers, LT4 springs for hotcam)
GM double roller timing chain
GMHP waterpump
Longtube ceramic coated headers
3" Y-pipe
Magnaflow converter
flowmaster exhaust
K&N filter
and removed MAF screens

then, the car would not start.
then we replaced the Spark control module, and redid ALL grounds.
now vehicle starts but died after warm-up.
after cooling down car started after a few cranks and kept running.
BUT, After we shut off the car when it is warmed up it will crank over but not turn on.

So, we though we had a leaky injector fludding the engine, since after a few attemps of starting the car with the pedal at WOT it would start.

then, this weekend we replaced injectors with 30# accel injector, and also ordered a aeromotive FPRwhich we haven't installed yet.

And, we are still having the same problem.
car runs fine(we still haven't gotten on it yet since we are still having problems)but won't start after it gets warm.

And, fuel press. seems fine at ~40psi.
Also the car would die whenever we tried to hit the gas pedal once it was warm(200+)

So what could be causing this, we are going to be working on the car this weekend but we have run ou tof ideas.
So do any of you know what could be causing this or have any idea?

 

Do we assume it's a closed loop issue? Have you confirmed it's ok until it goes into closed loop?

Do you have an SES? Even if not, are there any codes? What are the sensors doing during all this?

 

No, there is not a SES or any other light coming on that we have noticed.
I cannot be able to see what the sensors are doing. I can probably have someone come over with a scan tool this weekend if needed.