How to troubleshoot a malfunctioning Audi A3 engine?

I noticed my Audi A3 engine is not running smoothly. What could be the cause of this problem and how can I fix it?

One possible cause for a malfunctioning Audi A3 engine could be a dirty air filter. Check your air filter and replace it if necessary. This should help improve engine performance.

Another reason for a rough running engine could be a faulty spark plug. Check your spark plugs and replace any worn out ones. This should help improve engine performance.

A clogged fuel filter can also cause engine problems. Make sure to replace your fuel filter regularly to prevent engine issues. You can find the location of your fuel filter in your Audi A3 owner's manual.