How to troubleshoot engine misfires on Audi A6?

I have been experiencing random misfires on my Audi A6 for the past month. The check engine light is on and sometimes the car has trouble starting. What could be causing this issue and how can I fix it?

The most common cause of engine misfires in Audi A6 is a faulty ignition coil. It is recommended to replace all ignition coils at once to prevent further issues. Also, make sure to check for any vacuum leaks in the intake system.

Another possible cause of engine misfires is a clogged fuel filter. Try replacing it and see if the issue persists. It is also important to make sure the fuel injectors are clean and in good working condition.