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1993 Cavalier vibrates when in drive with the brake held does a lot better park and at road speed?

Here are a few potential causes for the vibration you're experiencing when your 1993 Cavalier is in drive with the brake held:

- Engine mounts: Worn or damaged engine mounts can cause the engine to move excessively, leading to vibrations. Inspect the engine mounts for signs of wear or damage and replace them if necessary.

- Transmission mount: A worn or damaged transmission mount can cause the transmission to move excessively, leading to vibrations. Inspect the transmission mount for signs of wear or damage and replace it if necessary.

- Driveline components: Driveshaft, u-joints, and CV joints can cause vibrations if they are worn or damaged. Inspect these components for signs of wear or damage and replace them if necessary.

- Brake components: Warped brake rotors or damaged brake pads can cause vibrations when the brakes are applied. Inspect the brake rotors and pads for signs of wear or damage and replace them if necessary.

If you have ruled out these potential causes, you may need to have a qualified mechanic diagnose the source of the vibrations.