Why is my Kia Rio idling rough?

My Kia Rio has been idling really rough lately and I'm not sure what could be causing it. Any ideas?

It could be an issue with the fuel injectors or spark plugs. I would recommend getting those checked out and replaced if necessary.

Make sure to check the air filter and replace it if it's dirty. A dirty air filter can cause rough idling.

Another possibility could be a vacuum leak. Have a mechanic do a smoke test to check for any leaks and fix them accordingly.