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Would bad spark plugs cause a vehicle engine to shake?

Yes, bad spark plugs can definitely cause a vehicle engine to shake. Here's why:

* Misfires: A bad spark plug can fail to ignite the air-fuel mixture in the cylinder properly, leading to a misfire. This means that cylinder isn't contributing its full power to the engine's rotation, causing a noticeable shaking or vibration. The severity of the shake depends on how many cylinders are misfiring.

* Uneven Combustion: Even if the spark plug isn't completely failing, if it's worn or fouled, the spark might be weak or inconsistent. This leads to uneven combustion in the cylinders, again resulting in a rough running engine and shaking.

So, while engine shaking can have many causes, faulty spark plugs are a common and relatively easy-to-diagnose culprit.

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