* Torque Converter Issues: A failing torque converter (the fluid coupling between the engine and transmission) is a common cause. If it's not properly engaging, the engine might stall under load when you accelerate. This often manifests as a shuddering or slipping before the stall.
* Transmission Problems: Problems within the transmission itself (worn clutches, low fluid, internal damage) can prevent it from properly transferring power to the wheels. The engine might be running fine, but the transmission can't handle the demand.
* Fuel Delivery Problems: While the engine starts, a problem with the fuel pump, fuel filter, or fuel injectors could cause it to starve for fuel under load. The engine might run fine at idle but lack fuel when demanding more power.
* Crankshaft Position Sensor (CKP) or Cam Position Sensor (CMP) Issues: These sensors tell the engine's computer the position of the crankshaft and camshaft. If they're faulty, the computer might not get accurate information and shut the engine down to prevent damage. This is more likely if the engine stalls even *without* the gas pedal.
* Throttle Position Sensor (TPS): A faulty TPS won't accurately tell the computer how much you're pressing the gas pedal, leading to incorrect fuel and ignition timing. This can cause stalling under load.
* Mass Airflow Sensor (MAF) Issues: A dirty or faulty MAF sensor provides inaccurate information about the amount of air entering the engine. This can lead to a lean fuel mixture and stalling.
* Electrical Problems: A loose connection, faulty wiring, or a failing alternator could disrupt the power supply to the engine or transmission, causing it to shut off.
* Computer/ECM Problems: A malfunctioning Engine Control Module (ECM) can cause a variety of issues, including stalling. This is less common but a possibility.
What to do:
1. Check Fluids: Start by checking your transmission fluid level and condition. Low or dirty fluid is a major suspect. Also check your engine oil level.
2. Diagnostics: A professional mechanic can use a scan tool to read diagnostic trouble codes (DTCs) from your vehicle's computer. This can pinpoint the problem much more quickly and accurately.
3. Don't Keep Trying: Repeatedly trying to start and accelerate the vehicle could cause further damage. Have it towed to a mechanic.
Ignoring the problem can lead to more extensive and expensive repairs. Get it diagnosed and fixed as soon as possible.
