How to troubleshoot a common BWM engine issue?

I have a BWM engine that is running rough and experiencing decreased power. What could be causing this issue and what steps should I take to diagnose and resolve it?

First, check the spark plugs and ignition coils for any signs of wear or damage. These components are a common cause of engine misfires in BWM engines.

Another possible cause could be a clogged fuel filter. It's important to regularly replace your fuel filter to ensure optimal engine performance.

A failing oxygen sensor can also lead to rough running and decreased power. Have it checked and replaced if necessary.