How to fix a rough idle in an Audi 80?

I have noticed that my Audi 80 has a rough idle, and it seems to be getting worse. What could be causing this issue and how can I fix it?

First, check for any vacuum leaks in the engine. These can cause rough idle and can easily be fixed by replacing any leaking hoses. You should also check your spark plugs and ignition coils, as worn out or faulty components can also contribute to a rough idle.

Another potential culprit for a rough idle in an Audi 80 is a dirty or clogged fuel filter. If the filter is clogged, it can restrict the flow of fuel to the engine, causing it to idle roughly. It's a good idea to replace the fuel filter every 30,000 miles or so to prevent this issue.