92 olds 88 royale making loud vibration noise during idle esp at lightidles very hard at stoplight how do you stop that?

Loud vibrations in a 1992 Oldsmobile 88 Royale during idle could be caused by several issues, such as worn motor mounts, a misfiring engine, or a dirty throttle body. First, check the motor mounts for any signs of wear or damage, as they can transmit vibrations to the chassis. Additionally, inspect the ignition system and fuel injectors for proper functioning, and clean the throttle body to ensure smooth airflow. If the problem persists, consulting a mechanic for a thorough diagnostic may be necessary.