What causes a rough idling in an Audi 80?

I recently noticed that my Audi 80 has a rough idling when I start the engine. What could be the cause of this and how can I fix it?

The most common cause of a rough idling in an Audi 80 is a dirty air filter. Try replacing the air filter and see if that improves the idling.

Another possible cause is a clogged fuel filter. When was the last time you had it replaced? If it's been a while, consider getting it changed as it can greatly affect the idling of your Audi 80.