What is the most common reason for engine misfires in an Audi 80?

I've been experiencing engine misfires in my Audi 80 and I'm not sure why. Can anyone help me pinpoint the most likely cause and tell me how to fix it?

The most common reason for engine misfires in an Audi 80 is faulty spark plugs. Check the condition of your spark plugs and replace them if necessary.

Another common reason for engine misfires in an Audi 80 is a clogged fuel filter. Try replacing your fuel filter and see if that improves your engine performance.