* Fuel Pump: A failing fuel pump can't deliver enough fuel under pressure when you accelerate. This is a very common cause. Symptoms can include hesitation, sputtering, and ultimately stalling. Listen carefully for the whine of the fuel pump when you turn the key to the "on" position (before cranking). If you don't hear it, or it sounds weak, it's a strong suspect.
* Fuel Filter: A clogged fuel filter restricts fuel flow, causing similar symptoms to a failing fuel pump. It's a relatively inexpensive part to replace, so it's worth checking/replacing if the pump seems okay.
* Mass Airflow Sensor (MAF): The MAF sensor measures the amount of air entering the engine. A faulty MAF sensor provides inaccurate readings, leading to a lean fuel mixture (not enough fuel for the air) which can cause stalling, especially under acceleration.
* Throttle Position Sensor (TPS): The TPS tells the computer the throttle's position. A faulty TPS provides incorrect information to the computer, leading to improper fuel delivery and timing.
* Crankshaft Position Sensor (CKP): The CKP sensor tells the computer the engine's rotational speed and position. A faulty CKP can cause misfires and stalling, especially under load (acceleration).
* Ignition System: While less likely to cause an immediate shutoff upon acceleration, problems with the ignition coil, spark plug wires, distributor cap (if applicable - some LT1s are distributorless), or spark plugs can cause misfires that could lead to stalling under stress.
* Computer/ECM issues: While less common, a faulty Engine Control Module (ECM) could be causing the problem. This is more difficult to diagnose and would likely require professional help.
* Fuel pressure regulator: This regulates the fuel pressure in the system. A faulty regulator could lead to inconsistent fuel pressure, causing stalling.
Troubleshooting Steps:
1. Check for error codes: Use an OBD-I scanner to check for diagnostic trouble codes (DTCs). This will give you a starting point.
2. Listen for the fuel pump: As mentioned above, listen for the fuel pump prime when you turn the key to the "on" position.
3. Check the fuel pressure: A gauge can measure fuel pressure to see if it's within specifications.
4. Inspect the fuel filter: Visually inspect the fuel filter for damage or debris.
5. Check the MAF sensor and TPS: These can often be cleaned, though replacement might be necessary.
6. Inspect the ignition system: Check for worn spark plug wires, cracked distributor cap (if applicable), and worn spark plugs.
Recommendation: Start with the simpler, cheaper checks (fuel pump, fuel filter) before moving on to more complex components. If you're not comfortable working on your car yourself, take it to a qualified mechanic. Diagnosing this issue correctly requires some automotive knowledge and tools.
