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What causes a intermittent rough idle with strong exhaust rich mixture smell than corrects itself when turning key off on quickly for 1989 ford mustang GT?

1. Vacuum Leak: Vacuum leaks can cause the engine to receive incorrect air/fuel ratios. This can lead to a rough idle, as well as a rich exhaust smell.

2. Faulty Oxygen Sensor: The oxygen sensor is responsible for monitoring the air/fuel ratio in the engine's exhaust. If it becomes faulty, it can send incorrect signals to the engine computer, which can lead to a rich mixture.

3. Damaged Idle Air Control Valve: The idle air control valve is responsible for regulating the amount of air that enters the engine when it's idling. If it becomes damaged or clogged, it can cause a rough idle and rich mixture.

4. Fuel Injector Issues: Leaking or stuck fuel injectors can cause the engine to receive too much fuel, which can lead to a rich mixture and a rough idle.

5. Malfunctioning EGR Valve: The exhaust gas recirculation (EGR) valve is responsible for recirculating exhaust gases back into the engine. If it becomes faulty or stuck open, it can cause a rich mixture and a rough idle.

6. Faulty Mass Air Flow Sensor: The mass air flow (MAF) sensor measures the amount of air entering the engine, which is used to calculate the fuel mixture. If it becomes faulty or dirty, it can send inaccurate signals to the engine computer, which can lead to a rich mixture.

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