How to troubleshoot engine misfire in an Audi 80?

My Audi 80 is experiencing engine misfire, causing a rough idle and decreased performance. How can I diagnose and fix this issue?

First, check your spark plugs and ignition coils to see if they need to be replaced. If that doesn't solve the issue, it could be a clogged fuel injector or a faulty oxygen sensor. It's also a good idea to check for any vacuum leaks. If you're unsure, take it to a mechanic for a thorough inspection.