How to troubleshoot low power issue on Audi 80?

I have a 2003 Audi 80 and recently noticed that it's lacking power when accelerating. The engine seems to be running fine but I'm not getting the usual power and performance. What could be causing this issue?

First and foremost, check the air filter and clean or replace it if necessary. A clogged air filter can restrict airflow and greatly affect performance. Also, make sure your spark plugs are in good condition and properly gapped.

It's possible that your fuel filter is clogged and not allowing enough fuel to reach the engine. This can result in a loss of power. Consider replacing the fuel filter and see if that improves your car's performance.

Have you checked the condition of your car's catalytic converter? A failing catalytic converter can cause a decrease in power and acceleration. Consider having it inspected and replaced if necessary.