What is the root cause of the rough idle issue in Audi 80?

I have noticed that my Audi 80 has a rough idle, and I am wondering what could be causing it. It's a persistent issue that I would like to fix as soon as possible. Can anyone provide some insight into what could be causing this?

One common cause of a rough idle in Audi 80 can be a dirty or clogged air filter. Make sure to regularly check and replace your air filter to ensure smooth idling.

Another possible cause of rough idle in Audi 80 is a faulty ignition coil. If you notice that the engine is misfiring or the check engine light is on, consider checking the ignition coils.