How can I troubleshoot high idle issues in my Audi 80?

I recently noticed that my Audi 80 is idling at a higher rpm than normal. What could be causing this and how can I fix it?

High idle issues can be caused by a vacuum leak, faulty idle control valve, or a dirty throttle body. Start by checking for any leaks and cleaning your throttle body. If that doesn't resolve the issue, it may be a faulty idle control valve. Consult a mechanic for further troubleshooting.