What is the best way to diagnose an engine misfire in an Audi 80?

I have noticed some rough idling and a lack of power in my Audi 80. I suspect it may be an engine misfire, but I'm not sure how to diagnose it. Can anyone recommend the best approach?

First, use a code reader or diagnostic tool to check for any trouble codes related to engine misfires. Then, perform a compression test to check for any issues with the engine's cylinders. Finally, inspect the spark plugs and ignition system for any problems. Don't forget to also check for any vacuum leaks!

One common cause of engine misfires in Audi 80s is faulty ignition coils. You can use a multimeter to test the resistance of each coil and see if any are within the recommended range. If not, they may need to be replaced.

Before jumping to more complex diagnostics, try replacing the fuel filter. A clogged filter can cause a drop in fuel pressure and lead to engine misfires. It's an easy and relatively inexpensive fix.