What are the common issues with the ignition system of the Audi 80?

I've been noticing some strange behavior from my Audi 80's engine when starting it up. Sometimes it takes a while to start, and other times it starts quickly but idles roughly. Is there a common issue with the ignition system that I should check for?

One common issue with the Audi 80's ignition system is a faulty ignition coil. This can cause inconsistent starting and rough idling. Consider getting it checked and replaced if necessary.

Another common issue is a worn out or dirty spark plug. This can cause issues with starting, as well as poor engine performance. It's a relatively inexpensive fix that can make a big difference.

Make sure to also check the ignition control module and distributor cap for any signs of wear or damage. These components play critical roles in the ignition system and can cause issues if not functioning properly.