How to improve the performance of my Ford Transit Custom engine?

I recently purchased a Ford Transit Custom and I have noticed that the engine seems to be running a bit sluggish. Are there any tips or tricks I can use to improve its performance?

One of the main causes of poor engine performance is a dirty air filter. Check and replace the air filter if necessary. This can greatly improve the airflow to the engine and increase its performance.

Another aspect to consider is the spark plugs. Over time, they can become worn out and affect the engine's ignition. Replace the spark plugs regularly to ensure optimal performance.