How do I diagnose an engine misfire in my Audi 80?

My Audi 80 is experiencing an engine misfire and I'm not sure how to diagnose the issue. Can someone provide some advice on where to start looking?

First, you should check the spark plugs to see if they need to be replaced. If the spark plugs look worn or damaged, it could be the cause of the misfire. Make sure to replace all of the spark plugs if needed.

Another possible cause could be a clogged fuel injector. Try using a fuel injector cleaner to see if it helps improve the engine's performance. If not, you may need to replace the injector.

You should also check the ignition coil and ignition wires to see if they are functioning properly. If they are damaged or worn, it can cause the engine to misfire.