* Fuel filter: A clogged fuel filter can restrict fuel flow and cause the engine to stall. Replace the fuel filter if it is dirty or clogged.
* Fuel pump: A weak or failing fuel pump can also cause the engine to stall. Check the fuel pressure to see if it is within the manufacturer's specifications. If the fuel pressure is low, replace the fuel pump.
* Fuel injectors: Dirty or clogged fuel injectors can prevent the engine from getting the fuel it needs. Remove the fuel injectors and clean them with a fuel injector cleaner.
2. Check the ignition system:
* Spark plugs: Worn or fouled spark plugs can cause the engine to stall. Replace the spark plugs if they are worn or fouled.
* Spark plug wires: Damaged or loose spark plug wires can also cause the engine to stall. Check the spark plug wires for damage and replace them if necessary.
* Distributor cap and rotor: A cracked or damaged distributor cap or rotor can also cause the engine to stall. Replace the distributor cap and rotor if they are damaged.
3. Check the vacuum system:
* Vacuum leaks: Vacuum leaks can cause the engine to stall by allowing unmetered air into the engine. Check for vacuum leaks by spraying a mist of water around the vacuum lines. If the engine idle changes when you spray water on a vacuum line, there is a leak. Repair the vacuum leak.
* Idle air control valve: The idle air control valve controls the amount of air that bypasses the throttle body at idle. If the idle air control valve is faulty, it can cause the engine to stall. Clean the idle air control valve and check its operation.
4. Check the electrical system:
* Battery: A weak or dead battery can cause the engine to stall. Check the battery voltage to see if it is within the manufacturer's specifications. If the battery voltage is low, charge or replace the battery.
* Alternator: A faulty alternator can also cause the engine to stall. Check the alternator output to see if it is within the manufacturer's specifications. If the alternator output is low, replace the alternator.
* Starter: A faulty starter can also cause the engine to stall. Check the starter operation to see if it is engaging properly. If the starter is not engaging properly, replace the starter.
5. Check the engine control module (ECM):
* The ECM is the computer that controls the engine's operation. If the ECM is faulty, it can cause the engine to stall. Have the ECM tested by a qualified technician.
