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Why would a 1990 Acura Integra vibrate when goes over 55 mph?

1. Tire balance: Unbalanced tires can cause vibrations at higher speeds. Take your car to a tire shop to have your tires balanced.

2. Wheel alignment: Incorrect wheel alignment can also cause vibrations. Have your car's wheel alignment checked and corrected if necessary.

3. Driveshaft problems: A damaged or misaligned driveshaft can also cause vibrations. Inspect the driveshaft for any damage and have it repaired or replaced if necessary.

4. Engine mounts: Worn or damaged engine mounts can allow the engine to move excessively, which can cause vibrations. Inspect the engine mounts and replace them if necessary.

5. Transmission mount: A worn or damaged transmission mount can allow the transmission to move excessively, which can also cause vibrations. Inspect the transmission mount and replace it if necessary.

6. Wheel bearing problems: Worn or damaged wheel bearings can also cause vibrations. Check the wheel bearings for play or roughness and replace them if necessary.

7. CV joints: Worn or damaged CV joints can also cause vibrations. Inspect the CV joints for any damage and replace them if necessary.