What causes a 1993 Buick Roadmaster to have a rough idle?

A rough idle in a 1993 Buick Roadmaster can be caused by several factors, including a dirty or faulty idle air control valve, vacuum leaks in the intake system, or worn spark plugs and ignition components. Additionally, issues with the fuel delivery system, such as a clogged fuel filter or failing fuel injectors, can contribute to uneven engine performance. It's also important to check for any diagnostic trouble codes that may indicate specific problems. Regular maintenance and timely repairs can help alleviate these issues.