How to troubleshoot engine misfire on Audi 80?

My Audi 80 has been experiencing engine misfire and I'm not sure how to fix it. It's been causing a rough idle and decreased performance. Any advice on where to start?

First, check for any faulty or damaged spark plugs. This is the most common cause of engine misfires in cars. If they look worn or dirty, replace them with new ones.

The next step would be to check the ignition coils. These can become weak over time and cause misfires. Use a spark tester to see if they are producing a strong spark.