Why is the engine of my 1992 Audi 80 running rough when idling?

I recently got my 1992 Audi 80 serviced and noticed that the engine seems to run rough when idling. It also hesitates a bit when I accelerate. Any ideas what could be causing this issue?

It sounds like your spark plugs may need to be replaced. This can often cause rough idling and hesitation while accelerating. I recommend getting them checked and replaced if necessary.

Your air filter could be clogged which can cause the engine to run rough. Try replacing the air filter and see if it improves.

Another possible cause could be a dirty fuel injector. You may need to get them cleaned or replaced.