Hi, Shannon and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition and leaking check for spark leakage in the dark.
3. Spark plug gap too close or too wide.
4. Faulty ignition coil, module, and or sensor.
5. Battery nearly discharged.
6. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
7. Intermittent short circuit due to damaged wire insulation.
8. Dirty air filter
9. Intake air leak.
10. Water, dirt, or rust in the fuel system, fuel pump and/or filter.
11. Old dead or bad fuel.
12. A faulty fuel pressure regulator.
13. Pinholes in the in-tank plastic convoluted tubing from the pressure regulator to the quick disconnect check valve.
14. Fuel tank vent system plugged.
15. The throttle body controls misadjusted.
16. Damaged throttle body or intake seals.
17. Clogged or faulty fuel injectors.
18. Loose, dirty, or corroded ignition module connector at crankcase.
19. Faulty TPS, MAP, CKP, O2, and/or CMP sensors.
20. Incorrect valve timing.
21. Weak or broken valve springs.
22. Damaged intake or exhaust valve.
23. The control module may be in limp mode.
24. Check for engine trouble codes.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day. https://www.cargurus.com/Cars/Discussion-t7364_ds481764 https://www.cargurus.com/Cars/Discussion-c2463_ds483482 https://www.youtube.com/watch?v=lReN7OT5GjM https://www.youtube.com/watch?v=Jv-1tMi_85g https://www.youtube.com/watch?v=RXAWlaq59XQ
2002 Kia Sportage 2.0L dohc, is an interference engine, will cause piston to valve damage, Kia recommends timing belt replacement in California every 90,000 miles, except California every 60,000 miles, hope this was very helpful.