How to troubleshoot a failing spark plug in an Audi A4?

I've recently noticed that my Audi A4 is experiencing a misfire and hesitation while accelerating. Upon further inspection, I suspect that one of the spark plugs may be failing. What steps should I take to troubleshoot and fix this issue?

First, you should confirm your suspicion by performing a spark plug test using a multimeter. This will help identify the faulty spark plug. From there, you can replace the spark plug and retest to see if the issue has been resolved.

Another potential issue could be a clogged fuel injector. It's worth checking and cleaning the injectors to see if this improves engine performance.

You may also want to check your ignition coils for any signs of damage. If they are cracked or corroded, they may need to be replaced to resolve the issue.