What are common problems that can cause a Audi 80's engine to misfire?

I have noticed some hesitations and roughness while driving my Audi 80. What could be the potential causes for this issue and how can I fix it?

One common cause of engine misfires in the Audi 80 is faulty spark plugs. It is recommended to check and replace them if necessary.

Another potential cause is a clogged fuel injector. It is recommended to have them cleaned or replaced for optimal engine performance.