* Distributor Timing: A mistimed distributor is a very likely culprit. Even a slight misalignment can prevent the engine from firing consistently. When you're pressing the gas pedal, you might be inadvertently altering the air/fuel mixture in a way that allows the engine to fire intermittently. Double-check your distributor timing. You'll need a timing light to do this correctly. Refer to your vehicle's service manual for the proper timing specifications.
* Throttle Position Sensor (TPS): A faulty TPS won't give the computer (even if bypassed for the pump) accurate information about throttle position. This can lead to improper fuel delivery and cause the engine to stall. A bad TPS could be causing the car to die when you release the gas pedal.
* Crankshaft Position Sensor (CKP): The CKP sensor tells the computer where the crankshaft is in its rotation. A faulty CKP sensor will cause erratic engine operation or stalling. This sensor is critical for ignition timing.
* Fuel Pressure Regulator: While you've confirmed the pump works, the fuel pressure regulator might be faulty. It might be delivering inconsistent fuel pressure, leading to stalling.
* Airflow Sensor (MAF): A faulty MAF sensor can cause improper air/fuel mixture, resulting in stalling.
Troubleshooting Steps:
1. Verify Distributor Timing: This is the most likely suspect given the recent distributor change. Get the timing right using a timing light and your car's specifications.
2. Check for Vacuum Leaks: A significant vacuum leak can also cause stalling. Inspect all vacuum hoses and connections.
3. Test TPS: This requires a multimeter and testing according to your car's specifications.
4. Test CKP Sensor: This also typically involves a multimeter and verifying the sensor's output signal while cranking.
5. Check Fuel Pressure: A fuel pressure gauge is needed here to see if the pressure is consistent and within specification.
Since you've already addressed the fuel pump, focus on the ignition system (distributor timing, CKP sensor) and the sensors that control fuel delivery (TPS, MAF). A service manual for your 1992 Camaro will be incredibly helpful during this process. It will contain diagrams, specifications, and troubleshooting guides.
