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2003 gran marquis the car shakes and check engine light is on blinks what could be problemthank you?

There are several potential causes for your car shaking and the check engine light blinking. Here are a few possibilities:

- Spark plugs or ignition coils: Faulty spark plugs or ignition coils can cause the engine to misfire, which can lead to shaking and a blinking check engine light.

- Fuel injector: A clogged or faulty fuel injector can prevent the engine from getting the proper amount of fuel, which can also cause shaking and a blinking check engine light.

- Vacuum leak: A vacuum leak can cause the engine to run lean, which can lead to shaking and a blinking check engine light.

- Oxygen sensor: A faulty oxygen sensor can cause the engine to run rich or lean, which can lead to shaking and a blinking check engine light.

- Catalytic converter: A clogged or faulty catalytic converter can cause the engine to run poorly, which can lead to shaking and a blinking check engine light.

If you are experiencing these symptoms, it is important to have your car diagnosed by a qualified mechanic as soon as possible. Driving with a shaking engine and a blinking check engine light can damage your car's engine and other components.