I may be wrong but it sounds like the MAF is dirty. You may want to try dissconnecting it and see if it will run in open loop until you can clean the Mass Air Flow sensor with special cleaner only from Auto Parts Store.
Air filter may be dirty,
Coolant temperature sensor.
You will need to read the troubleshooting area and I hope someone here knows because I haven"t seen this one before.
http://kiatechinfo.com/
Go here and join free, this is the Official Kia website. After joining go to " Service Info ", then select , SPORTAGE(AL) >2000 > G 2.0 DOHC > Engine Control/Fuel System > Engine Control System > Troubleshooting.
Hope this gets you started...
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