How to troubleshoot a sputtering engine in a Vauxhall Insignia?

I have been experiencing a sputtering engine in my Vauxhall Insignia and it seems to be getting worse. What could be causing this issue and how can I fix it?

The sputtering could be caused by a dirty air filter. Try replacing it and see if that resolves the issue.

Another potential cause could be a faulty fuel pump. It's best to have a mechanic check it out and replace it if necessary.

You may also want to check the spark plugs. If they are worn or dirty, they could be causing the sputtering. Replace them if needed.

Make sure to also check the fuel injectors for any clogs or issues. If they are not functioning properly, it could lead to a sputtering engine.

Finally, check the ignition coils to see if they are functioning correctly. If any are faulty, have them replaced to fix the sputtering issue.