Fuel System:
* Fuel Pump Failure: The fuel pump may be failing to deliver enough fuel, especially under load (when in gear).
* Fuel Filter Clog: A clogged fuel filter restricts fuel flow.
* Fuel Injectors: Clogged or malfunctioning fuel injectors can prevent proper fuel delivery.
* Low Fuel: Sounds obvious, but make sure you're not running on fumes!
Ignition System:
* Crankshaft Position Sensor (CKP): This sensor tells the computer the engine's position; a faulty sensor can cause the engine to stall.
* Camshaft Position Sensor (CMP): Similar to the CKP sensor, a faulty CMP sensor can lead to stalling.
* Ignition Coil(s): A failing ignition coil can prevent one or more cylinders from firing.
* Spark Plugs/Wires: Worn-out spark plugs or damaged wires can disrupt the spark needed for combustion.
Other Electrical Issues:
* Alternator: A failing alternator can't recharge the battery, leading to a sudden power loss. This is often accompanied by a warning light on the dashboard.
* Battery: A weak or dying battery can't provide enough power to the engine.
* Wiring Problems: Damaged or corroded wiring can disrupt electrical signals to various components.
* ECU (Engine Control Unit): A faulty ECU can cause a wide range of problems, including stalling. This is less common but possible.
Transmission Related (Less Likely but Possible):
* Neutral Safety Switch: This switch prevents the engine from starting unless the car is in Park or Neutral. A faulty switch might be causing intermittent issues. (More likely to prevent starting than stalling *while* driving.)
Other Possible Causes:
* Vacuum Leaks: Leaks in the vacuum system can affect engine performance and cause stalling.
* Throttle Position Sensor (TPS): A faulty TPS can cause inaccurate fuel delivery.
What to do:
1. Safety First: Pull over to a safe location if the car cuts off while driving.
2. Check the Obvious: Ensure you have enough fuel. Check the battery terminals for corrosion.
3. Check Engine Light: Is the check engine light on? If so, get the codes read at an auto parts store (often free) or a mechanic. This will give you valuable clues.
4. Listen for Sounds: Unusual noises (clicking, whirring, etc.) can help pinpoint the problem.
5. Professional Diagnosis: The best approach is to take your car to a qualified mechanic for proper diagnosis and repair. Trying to fix this yourself without experience could lead to further damage.
Don't attempt to drive the car extensively if it's cutting off intermittently, as this could lead to dangerous situations. Get it checked out as soon as possible.
