Kia Troubleshooting Questions? Ask a Mechanic
Which engine do you have in this please?
Also, is this condition happening once the engine gets up to operating temp?
Ok, is the check engine light on when the car is running?
Ok, the symptoms sound like either a bad mass air flow sensor or a plugging catalytic converter.
I would start by unplugging the mass air flow sensor, then start the car and see if you can mimic the symptoms. If not, then the maf is the issue and it should be replaced.
If there isn't any change at all, then I would remove the top O2 sensor and start the car. It will be loud, but it's ok. We are looking to see if it runs better with the sensor out. This gives the exhaust a place to go if the converter is plugged or plugging up.
Try these and let me know.
Do you need further assistance with this?