XXXXXXXXX,
The LT1's had a common problem with the fuel pressure regulator diaphram going bad. I would start there by pulling the vacuum line to the regulator and checking for raw fuel in the line. If the line is wet inside with fuel, replace the regulator.
Check fuel pressure. Hook a pressure gage to the schrader valve on the fuel rail and start the car. Pressure should be 41-47lbs. If it is low and the fuel filter has not been changed in a while replace it and recheck pressure.
The Mass Airflow Sensor is another place to check but should set a code in the PCM which would turn on the check engine light. You can try unplugging it to see if the car will respond. If the engine will respond with the MAF disconnected, replace it. Also check the hose that runs from the mass air flow sensor to the throttle body for any leaks. Holes, tears, loose clamps. Anything that will allow air to enter the engine after the mass air flow sensor will be unmetered air that cannot be compensated for by the PCM and will cause stalling.
Lastly, check for vacuum leaks. Lines and manifold gaskets leaking will cause a lean condition and stall the engine. A vacuum gage is a good cheap tool to use for checking. Hook the gage to a manifold vacuum port. Normal vacuum for idle should be around 50hg.
The fuel pressure regulator is on the fuel rail that the injectors connect to and will have a single vacuum line running to it.
Shawn
ASE Certified Technician
PA Certified Inspection emissions, ASE Brakes Suspension, Lead diagnostic Tech.20 years exp