* Fuel pressure regulator: This component regulates the fuel pressure in the fuel rail. A faulty regulator might not be able to maintain sufficient pressure when the engine demands more fuel under acceleration. It could be leaking pressure back into the return line, causing a drop in fuel delivery.
* Throttle Position Sensor (TPS): This sensor tells the computer the position of the throttle. A faulty TPS could send incorrect signals, leading to improper fuel delivery. The engine might be getting too little fuel or even an incorrect air/fuel mixture when you accelerate.
* Mass Airflow Sensor (MAF): This sensor measures the amount of air entering the engine. A faulty MAF sensor provides incorrect data to the computer, leading to an incorrect fuel calculation. Similar to the TPS, this can cause a lean condition (not enough fuel) under acceleration.
* Clogged fuel injectors: While less likely given the new fuel filter, partially clogged injectors could restrict fuel flow under increased demand. They may work fine at idle but struggle to deliver enough fuel when you accelerate.
* Ignition system issues: Although less probable given your description, a problem in the ignition system (distributor cap, rotor, ignition coil, spark plug wires, or even the plugs themselves) can cause a misfire under load. This could manifest as stalling. A weak spark might be enough for idling, but not sufficient under acceleration.
* Vacuum leaks: A vacuum leak can disrupt the air/fuel mixture, resulting in stalling, particularly under acceleration. Inspect all vacuum lines and the intake manifold for cracks or leaks.
Troubleshooting Steps:
1. Check fuel pressure: Use a fuel pressure gauge to monitor fuel pressure at idle and while attempting to accelerate. A drop in pressure under acceleration points to a regulator problem.
2. Inspect the TPS and MAF: Visually check for damage and consider having them tested with a multimeter or by a professional.
3. Check for vacuum leaks: Use a propane torch (carefully!) or a vacuum gauge to check for leaks in the vacuum system.
4. Consider a fuel injector cleaning or replacement: If fuel pressure is good and the sensors are fine, clogged injectors may be the culprit. A fuel injector cleaner might help, but replacement might be necessary.
5. Inspect the ignition system: Although less likely, check the distributor cap, rotor, wires, and plugs for wear or damage.
It's highly recommended to use a scan tool (OBD1 for a '91 Camaro) to retrieve any diagnostic trouble codes (DTCs) that might be stored in the computer. This could provide clues to the specific problem. If you lack experience with auto repair, taking it to a qualified mechanic is the safest and most efficient way to diagnose and fix the issue.
