Check Engine Light illumination—combined with a lack of power or a stumble on acceleration—may be caused by the throttle position switch (TPS). Kia released an improved part which should correct this concern.
Problems for specific Kia Sportage years:
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Repairpal verified 1998 Kia Sportage problems
Vehicles driven in areas where roads are heavily salted in winter may experience corrosion of the fuel tank, which can result in a leak. Kia has extended the fuel tank warranty on the 1996-2002 models. Please check with you local Kia dealer for more information, the service bulletin number is 059