Ok, purchased a 91 z28 5.0 TPI auto camaro, runs fine but after about 30 mins, car bogs down, stalls and won't run for about 3hours.

getting no error codes.

whats been replaced:
new ECM
used but known working injectors
new map sensor
new temp sensors

new ignition module, rotor cap/button.
fairly new fuel pump
No vacuum leaks

has no cats on it

I drive it to/from work, anything after 30 minutes and the car will jump/and then stall out, will start for and idle for a few minutes then once drive is engaged and gas pedal applied=instant stall.

Anything to check for, advice would be greatly appreciated.

thanks
james G

 

Ohm the injectors. They can get lousy as they heat up.