How to improve the performance of my Ford Puma's engine?

I have a Ford Puma and I've been noticing that the engine is not performing as well as it used to. What could be the possible reasons and how can I improve its performance?

One possible cause for a decrease in engine performance could be dirty spark plugs. Make sure to clean them regularly or replace them if necessary.

Another reason for poor engine performance could be a clogged air filter. Check the filter and replace it if needed.