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What causes a 1997 Honda Accord to cut out while driving or stopped at sign?

1. Idle Air Control (IAC) Valve: The IAC valve controls the amount of air that bypasses the throttle plate when the engine is idling. If the IAC valve is faulty or dirty, it can cause the engine to stall at idle or while driving.

2. Throttle Position Sensor (TPS): The TPS tells the engine control unit (ECU) the position of the throttle plate. If the TPS is faulty, it can provide incorrect data, causing the ECU to manage the air-fuel mixture incorrectly and leading to stalling.

3. Fuel Pump/Fuel Filter: A weak fuel pump or clogged fuel filter can cause the engine to be starved of fuel, leading to stalling.

4. Ignition System: Problems with the spark plugs, spark plug wires, or ignition coil can also cause the engine to stall. Check for worn or damaged components and replace them as necessary.

5. Air Filter: A clogged or dirty air filter can restrict airflow to the engine, leading to stalling.

6. Catalytic Converter: A plugged or damaged catalytic converter can cause the engine to stall as exhaust gasses cannot escape freely.

7. EGR (Exhaust Gas Recirculation) Valve: A stuck or faulty EGR valve can affect engine performance and cause stalling.

8. Vacuum Leaks: Leaks in vacuum hoses can lead to a lean air-fuel mixture and engine stalling. Inspect the hoses for cracks or tears and replace them if necessary.

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