How to troubleshoot common engine issues in the Vauxhall Vivaro?

I've been experiencing some issues with my Vauxhall Vivaro's engine, such as rough idling and decreased performance. What are some common causes for these issues and how can I troubleshoot them?

One common cause for rough idling in the Vauxhall Vivaro is a dirty or clogged fuel filter. Start by replacing the fuel filter and see if that improves the engine's performance.

Another possible cause for decreased engine performance is a faulty spark plug. Check each spark plug and replace any that are visibly damaged.

If the above methods don't improve the engine's performance, it's possible that there may be an underlying issue with the engine itself. I highly recommend taking your vehicle to a certified mechanic for a thorough inspection and diagnosis.