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Why would engine that was idling then suddenly die?

Several reasons an idling engine could suddenly die:

1. Fuel Supply Issues: If the fuel supply is disrupted or restricted, the engine will starve for fuel and eventually shut off. This could be due to a malfunctioning fuel pump, clogged fuel filter, or a problem with the fuel injector.

2. Air Intake Issues: A lack of oxygen can also cause the engine to die. This could be caused by a blocked air filter, a vacuum leak, or a problem with the throttle body.

3. Electrical Problems: Electrical issues can interfere with the ignition system and cause the engine to stall. This could be related to a faulty ignition coil, spark plugs, or a problem with the electrical wiring.

4. Engine Mechanical Issues: Mechanical issues, such as a broken timing belt, worn-out engine bearings, or low oil pressure, can also cause an engine to stall unexpectedly.

5. Sensor Failures: Sensors that provide information about the engine's performance to the engine control unit (ECU) can malfunction or become faulty, leading to incorrect fuel or ignition adjustments and causing the engine to stall.

6. Computer Malfunctions: In modern vehicles with electronic engine management systems, a malfunction in the ECU or other control modules can cause the engine to stall without warning.

To identify the exact cause of the issue and resolve it effectively, it is recommended to have the vehicle inspected by a qualified mechanic or automotive technician. They can conduct a thorough diagnostic test to pinpoint the source of the problem and provide appropriate repairs.