What causes a rough and stalling engine in the Audi 80?

I've been experiencing issues with my engine in my Audi 80, especially when idling. It feels rough and sometimes stalls. What could be causing this?

This could be due to a faulty mass airflow sensor. They are known to cause issues with engine performance. I would recommend having it checked and possibly replaced by a mechanic.

Another possible cause could be a dirty or clogged fuel filter. This can restrict the flow of fuel to the engine and cause rough idling. Try replacing the fuel filter and see if that improves the engine's performance.