How to diagnose and fix engine misfire on an Audi 80?

I have noticed a distinct misfire in my Audi 80's engine while accelerating. The check engine light has also appeared. What could be causing this and how do I fix it?

Firstly, I would recommend getting a diagnostic scan done to determine which particular cylinder is misfiring. Possible causes could include a faulty ignition coil or spark plug, clogged fuel injectors, or a vacuum leak. Once you have identified the issue, it can be easily resolved by replacing the faulty component.