Why is my Ford S-Max experiencing rough engine idle?

I recently purchased a used Ford S-Max and have noticed that the engine idle is rough and sometimes chokes. What could be causing this issue and what steps should I take to fix it?

The rough engine idle could be caused by a number of issues, such as a dirty air filter, clogged fuel injectors, or a faulty spark plug. I recommend taking your car to a trusted mechanic to have it diagnosed and repaired.

In my experience, rough engine idle in a Ford S-Max is often caused by a malfunctioning EGR valve. This can be a relatively simple fix, but I recommend consulting a mechanic for proper diagnosis and repair.