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Does bad gas make your car run rough or shake?

Bad gas, also known as contaminated fuel, can cause a variety of issues in a car, including rough running and shaking. This can happen due to several reasons:

1. Water in Fuel: If water is present in the fuel, it can cause the engine to run lean (not enough fuel) and lead to misfires. This results in rough running, shaking, and difficulty starting the engine.

2. Dirt and Debris: Contaminated fuel may contain dirt, rust, or other particles that can clog fuel injectors and filters. This can affect fuel flow and cause the engine to run unevenly, resulting in rough running and shaking.

3. Octane Rating: Bad gas can have a lower octane rating than required for the vehicle. Lower octane fuel can cause knocking or pinging sounds and contribute to rough running.

4. Fuel System Damage: Prolonged use of bad gas can cause damage to the fuel system components such as fuel injectors, pumps, and sensors. This can lead to various issues, including rough running and shaking.

5. Engine Performance Issues: Bad gas can affect engine timing and combustion, leading to reduced power and rough idling. This can cause the car to shake when running.

6. Engine Stalling: Bad gas can cause the engine to stall or hesitate during acceleration or idling. This is because the engine is unable to maintain a consistent fuel supply due to the contamination.

If you suspect that you may have bad gas in your car and it's causing rough running or shaking, it's important to have the vehicle checked by a qualified mechanic as soon as possible. The mechanic can identify the source of the issue and take the necessary steps to resolve it, which may include draining the bad fuel, cleaning the fuel system, and replacing damaged components.