Why is my Audi A3 engine revving while idling?

My Audi A3 has been running great for years, but recently I've noticed the engine seems to rev up and down while idling. It doesn't seem to affect driving performance, but it's a bit concerning. Any ideas what could be causing this?

This is a common issue in Audi A3s and can usually be traced back to a faulty idle air control valve. It's a relatively easy fix and you can usually find replacement parts for a reasonable price. Definitely worth looking into.