What can be the potential causes of rough idling in an Audi 80?

I recently purchased an Audi 80 and noticed that it tends to have a rough idle at low speeds. I would like to understand the possible causes for this issue to address it.

One possible cause of rough idling in an Audi 80 is a dirty or clogged fuel injector. This can impact the proper fuel-air mixture, leading to rough idling.

Another potential cause could be a faulty oxygen sensor. This sensor helps regulate the fuel-air mixture and if it is malfunctioning, it could result in rough idling.