What is the most common issue with the Ford Transit Custom's engine?

I recently purchased a Ford Transit Custom and within a few months, I noticed a decrease in engine performance. What could be causing this and how can I prevent it?

One common issue with the Ford Transit Custom's engine is carbon buildup. This can cause a decrease in performance and can be prevented by regularly using fuel additives and getting an engine flush.

Another issue could be a faulty fuel pressure regulator. This can cause uneven fuel distribution and result in a loss of power. Make sure to get this checked and replaced if necessary.

You may also want to check the air filter. If it's dirty, it can restrict airflow to the engine and affect performance. Replace it if necessary and make sure to change it regularly.