Why does your 1991 Pontiac sunbird idle high?

A 1991 Pontiac Sunbird may idle high due to several reasons, including a malfunctioning throttle position sensor, a vacuum leak, or a faulty idle air control valve. Additionally, dirty or failing fuel injectors can also cause irregular idling. It’s advisable to check for any trouble codes and inspect these components to diagnose the issue accurately. Regular maintenance and cleaning can help resolve high idle problems.