Why does my Kia Ceed have a rough idle?

My Kia Ceed seems to have a rough idle, I've noticed it when I am stopped at a red light. What could be causing this and how can I fix it?

One possible cause of a rough idle in a Kia Ceed could be a dirty air filter. I would recommend checking and replacing the air filter if it is dirty. Another possibility could be a faulty spark plug or spark plug wire, which may need to be replaced.

Another common cause of a rough idle in a Kia Ceed could be a vacuum leak. I suggest checking the vacuum hoses and connections for any cracks or leaks. Another potential solution could be getting a fuel injection cleaning to remove any buildup that may be causing the rough idle.

In some cases, a rough idle can be caused by a faulty idle air control valve. This valve controls the idle speed and can become clogged or malfunction over time. You may need to have it replaced by a mechanic if it is causing your rough idle.