How do I determine the cause of engine stalling in my Audi 80?

My Audi 80 has been stalling frequently, usually when I come to a stop at a traffic light. I have checked the fuel pump and filters, and they seem to be working fine. What could be the potential cause of this issue?

It sounds like your idle air control valve may be malfunctioning. This valve regulates the idle speed of your engine and can cause stalling if it is not functioning properly. I recommend having it checked and replaced if necessary.