How to diagnose and fix the rough idle in my Audi 80?

I recently started experiencing a rough idle in my Audi 80. The engine sporadically stalls and the RPM fluctuates. What could be causing this and how should I go about fixing it?

Based on your description, it sounds like your engine may have a vacuum leak. Inspect all hoses and seals for cracks or damage, and replace if necessary. A dirty air filter or faulty spark plugs could also be a potential cause. Try cleaning or replacing these components as well.

I've had a similar issue with my Audi 80 and it turned out to be a faulty mass air flow sensor. Have a mechanic run a diagnostic to check if it's functioning properly and replace if needed.