What causes a rough idle in an Audi 80 and how can it be fixed?

I've noticed that my Audi 80 has been idling roughly lately, with the RPMs jumping up and down. What could be causing this and what steps can I take to fix it?

One common cause of a rough idle in an Audi 80 is a dirty or clogged air filter. Make sure to regularly clean or replace your air filter to ensure proper airflow and smooth engine performance.

Another possible cause is a faulty mass air flow sensor. If this sensor is dirty or damaged, it can affect the air/fuel mixture in the engine and cause rough idling. Consider getting it checked and replaced if necessary.