How to diagnose and fix an engine misfire in an Audi 80?

I've been experiencing an engine misfire in my Audi 80 and I'm not sure what's causing it. The car has been hesitating and shaking while driving, and the check engine light is on. Can anyone provide some advice on how to diagnose and fix this issue?

First, check for any error codes using an OBD-II scanner. This will give you a starting point for troubleshooting. If the code indicates a misfire in a specific cylinder, you can swap the ignition coil and spark plug with another cylinder to see if the problem moves. If it does, then you know the issue is with the ignition components in that cylinder.

Another common cause of an engine misfire in an Audi 80 is a clogged fuel filter. This can restrict fuel flow to the engine and result in a misfire. It's a good idea to replace the fuel filter if it hasn't been changed in a while, or if you've been experiencing poor performance.

If you rule out the ignition and fuel system as the source of the misfire, it's possible that there is an issue with the engine's compression. A compression test can help diagnose this. Low compression in a cylinder can cause a misfire and should be addressed immediately.