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What would cause a 2000 Nissan Altima to have rough startup and strong gas smell?

1. Faulty fuel injector: A malfunctioning fuel injector can spray too much or too little fuel into the engine, causing a rough startup and strong gas smell.

2. Bad spark plugs: Worn-out or damaged spark plugs can prevent the engine from starting smoothly and can also cause a strong gas smell.

3. Vacuum leak: A vacuum leak can lead to a lean air-fuel mixture, which can cause a rough startup and strong gas smell.

4. Faulty oxygen sensor: A bad oxygen sensor can provide incorrect information to the engine's computer, leading to a rough startup and strong gas smell.

5. Clogged catalytic converter: A clogged catalytic converter can restrict exhaust flow and cause a rough startup and strong gas smell.

6. Faulty fuel pressure regulator: A faulty fuel pressure regulator can cause too much or too little fuel pressure, which can lead to a rough startup and strong gas smell.

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