Well I have a 2001 sportage 4 door, and had the same issues this past few weeks. Since I had no codes to read, I started replacing the oxygen senor, spark plugs, oil change, changed air filter to k&n,changed gas to 89 and finally when going down road, FINALLY, a check engine light at autozone for FREE. Code p0304, which means misfire in #4 cylinder, so pulled all off again, pulled #4 and found oil in the chamber. So bad Valve Cover Gasket, pulled that apart, found the gasket was out of sync, whoever put in back together after tune up in March 2001 at 80,000 miles, so realigned gasket, and no problems. NO sputtering like it's gonna die, no chugging.
Check your codes at Autozone unless in CA, it's free and they are extremely helpful. Gave me all the info and parts and I did the job myself. Took 2.5 hours, but the problem is fixed and Kia runs like a dream.
Good Luck
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