How to diagnose and fix a rough idle in an Audi 80?

I recently noticed my Audi 80 has been idling rough and occasionally stalling. What could be causing this issue and how can I go about fixing it?

There are a few possible causes for a rough idle in an Audi 80. It could be a dirty or faulty idle air control valve, a vacuum leak, or a problem with the spark plugs or ignition system. I recommend checking these components and cleaning or replacing them as needed. Also, make sure to check for any error codes using a diagnostic tool.

Another common issue that can cause a rough idle is a dirty or clogged fuel filter. If the filter is clogged, it can restrict fuel flow and cause the engine to run rough. It's a relatively simple fix, just replace the fuel filter.