How do I diagnose a misfiring engine in my Audi 80?

I have been experiencing frequent misfires in my Audi 80's engine, which is causing it to run rough and lose power. I have tried replacing the spark plugs and ignition coils, but the issue persists. What other steps should I take to accurately diagnose and fix this problem?

First of all, make sure all of your spark plugs and ignition coils are in good condition and properly installed. If they are, then it's possible that the issue is with the fuel injectors. You may need to clean or replace them to improve fuel delivery and resolve the misfires.

Another potential cause of misfiring in the Audi 80 is a faulty oxygen sensor. This sensor helps regulate the air/fuel mixture in the engine, so if it's not working properly, it can cause misfires. Have it tested and replaced if necessary.