Kia Troubleshooting Questions? Ask a Mechanic
Hello and welcome!
Have you pulled fault codes form the ecm?
this will give a good indication of were to start fault tracing.
A intake air leak will cause poor running, also a defective or dirty mass air flow sensor. try cleaning the maf and inspecting any lines for being disconnected or split. any kind of air leak between the maff and throttle body will cause the engine to run poor.