How do I troubleshoot lack of acceleration in my Audi A2?

I've noticed that my Audi A2 has been struggling with acceleration, particularly when climbing hills or merging onto highways. How do I diagnose and fix this issue?

Check your air filter. A clogged air filter can significantly reduce engine power and hinder acceleration. Consider changing it if it's dirty or hasn't been replaced in a while.

Have your fuel system checked. A failing fuel pump or dirty fuel injectors can also cause poor acceleration. Get a mechanic to inspect and clean or replace parts if necessary.

Check your spark plugs and wires. Worn or fouled spark plugs can negatively affect engine performance and acceleration. Consider getting them replaced if they're old.