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What causes a 1999 Mazda Melina to shut down when accelerating hard after it has warmed up?

Potential Causes:

1. Fuel Filter Clogging: A clogged fuel filter can restrict fuel flow to the engine, causing it to shut down when demanding more fuel during acceleration.

2. Fuel Pump Failure: A faulty fuel pump may not provide sufficient fuel pressure, especially under higher demand.

3. Ignition System Issues: Weak ignition components like spark plugs, wires, or coils may fail to provide a strong enough spark, leading to engine shutdown.

4. Air Flow Obstruction: If the air filter is dirty or the mass air flow sensor is malfunctioning, the proper air-fuel mixture may not be achieved, causing the engine to stumble or shut down.

5. Oxygen Sensor Issues: A faulty oxygen sensor can provide incorrect air-fuel mixture information to the engine computer, leading to performance problems.

6. Catalytic Converter Issues: A clogged or damaged catalytic converter can restrict exhaust flow and cause the engine to shut down.

7. Engine Cooling Issues: If the engine cooling system is compromised, the engine may overheat and go into protective shutdown mode.

8. Electrical Issues: Faulty electrical connections or a failing ignition switch can cause intermittent power loss, leading to engine shutdown.

Recommendation: It is best to have the vehicle diagnosed by a qualified mechanic to identify the specific cause and perform the necessary repairs.