How to troubleshoot a malfunctioning engine in Vauxhall Movano?

My Vauxhall Movano has been experiencing issues with its engine. It's not performing as it used to and I'm not sure what could be causing it. How can I diagnose and fix this issue?

Firstly, check the spark plugs and replace them if they are worn out. The spark plugs play a crucial role in the ignition system and if they are not in good condition, they can lead to engine performance issues.

Next, inspect the fuel injectors. If they are clogged or dirty, they can affect the fuel delivery to the engine and result in poor performance. Consider cleaning or replacing them if necessary.

It's also important to check the air filter. A dirty or clogged air filter can restrict airflow to the engine, leading to poor performance. Regularly replace the air filter to ensure optimal engine performance.

If the above steps don't solve the issue, it's possible that there is a problem with the fuel pump. Have it checked by a professional and consider replacing it if necessary.