Why is the idle RPM fluctuating in my Audi 80?

I've noticed that the idle RPM of my Audi 80 keeps fluctuating when the engine is warm, but it's fine when it's cold. Can someone explain why this is happening and how I can fix it?

This could be caused by a faulty idle air control valve or a vacuum leak in the intake system. I highly recommend bringing your car to a reputable mechanic for proper diagnosis and repair.

Have you checked your air and fuel filters? If they are dirty, they can cause fluctuations in idle RPM. Try replacing them and see if the issue improves.

I had a similar issue with my Audi 80 and it turned out to be a problem with the ignition system. Specifically, the spark plugs and ignition coils needed to be replaced. I suggest getting those checked as well.