How do I improve my Ford Focus engine's performance?

I have noticed that my Ford Focus's engine is not running as smoothly as before. What can I do to improve its performance?

One thing you can do is to regularly change your engine oil and other fluids. This can help keep your engine running smoothly and prevent any build-up that can affect its performance.

Another tip is to keep your tires properly inflated. This can improve your car's fuel efficiency and overall performance. Plus, it's also important for safety reasons.

If you want to take it a step further, you can also upgrade your spark plugs to high-performance ones. This can improve your engine's power and fuel efficiency.