Why does my Ford S-Max have a rough idle?

I've noticed lately that my Ford S-Max has a rough idle. It shakes and shudders when stopped at a red light or in traffic. It seems to be getting worse over time. What could be causing this issue and how can I fix it?

It sounds like your Ford S-Max may have a problem with the fuel delivery system. It could be a clogged fuel filter or a faulty fuel pump. I recommend taking it to a trusted mechanic to have it checked out.

Another possibility is that your Ford might have a vacuum leak. This can lead to a rough idle and other issues. I suggest checking all the hoses and connections to see if anything is loose or damaged.