Why does my Vauxhall Insignia's engine hesitate when accelerating?

I've noticed that when I press down on the gas pedal, my Vauxhall Insignia's engine hesitates before accelerating smoothly. This issue seems to be happening more frequently, what could be the cause of this and how can I fix it?

One possible reason for this hesitation could be a dirty or malfunctioning mass air flow sensor. Try cleaning or replacing it to see if that helps with the acceleration issue.

Another potential cause could be clogged fuel injectors. Using a fuel injector cleaner can help unclog them and improve engine performance.

If neither of those solutions work, then it could be a problem with the fuel pump. Have it checked and replaced if necessary.