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Why does your car shake when turning ignition?

There are several possible reasons why your car might shake when turning the ignition. Some of the most common causes include:

1. Engine Mounts: Worn out engine mounts can cause excessive vibration when the engine is turned on.

2. Spark Plugs: Faulty spark plugs can lead to misfires, which can cause the engine to shake.

3. Vacuum Leaks: A vacuum leak can result in a loss of vacuum pressure in the engine, which can lead to engine shaking.

4. Fuel Injectors: Clogged or malfunctioning fuel injectors can lead to a rough idle and engine shakes.

5. Drive Shaft Issues: Problems with the drive shaft can induce vibration when shifting gears.

6. Transmission Issues: Worn out or damaged transmission components, such as the torque converter or transmission mounts, can cause the vehicle to shake.

If you experience significant shaking when turning on your car's ignition, it's important to have the vehicle inspected by a professional to identify the exact cause of the issue.