* Misfires: Worn spark plugs or damaged plug wires can lead to misfires. A misfire is when a cylinder doesn't ignite properly. This creates an imbalance in the engine's power strokes, resulting in noticeable vibrations. The more misfires, the more severe the vibration.
* Rough Running: The uneven power delivery from misfires causes the engine to run roughly, which translates to shaking and vibrations felt throughout the car.
Therefore, if you're experiencing vibrations and suspect ignition system issues, bad spark plugs and/or wires are a strong possibility. It's a relatively inexpensive fix to replace them and see if that resolves the problem.
