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.Google+
Car Problem Reports
Kia Sportage Faulty Throttle Position Switch
Kia Sportage Problem
Exhaust & Emissions Affected: 2.7L V6
Average Mileage: 76,966 mi (27,000 mi - 181,700 mi)
Visitor, 1998 Kia Sportage, 156,061 mi
My 98 kia sportage hesitates while sitting or about to take off. When I give it acceleration it will proceed but at times stumbles when proceeding to go please help!
car lacks power may go up to about 20 miles then totally loses power
My 2006 Kia Sportage started stalling when I would come to a stop light/sign. It would start right back up but I was afraid that it might not. I took to the Kia dealer to troubleshoot. Of course it didn't happen for them. It continued to happen so I took it back and told them to figure it out. 2 days later, they replaced the throttle position switch and the problem seems to be fixed (4 days now without the problem). Cost for part was minimal - $41.00 but labor was $160. Total bill was $213.00 but I'm glad to pay it if the problem is fixed. My car only has 31,100 miles on it and otherwise, its been a great car.
Visitor, 2007 Kia Sportage, 181,700 mi
Hard downshift when brake is applied. Changed TPS and had dealer clear the codes and it runs fine again with no issues.
Visitor, 2009 Kia Sportage, 30,000 mi
Hit 30K miles exactly today. Noticed that the gas pedal was "sticking" slightly. Would step on the gas from a stopped position and have to press harder to accelerate and then the car jerks forward.