Check Engine Light - throttle problems on 2004 Kia Sorento

Purchased an '04 in mid 2005 with 30,000 mi on it. Just barely touch the accel pedal and the car would rocket from a dead stop. Horrible gas mileage. After 6 mos. the check engine light came on and the car became significantly slower and stopped downshifting when attempting to pass or speed up quickly. I know the two are connected somehow.. whats happening?

Asked by for the 2004 Kia Sorento
I have a 2005 sorento and had same problem. The code read throttle position sensor. I went to the dealer (dealer only part) and bought one of the great price of $116 and it took care of the problem.
2 answers
Hi, the next step is to have the diagnostic codes in the engine control module read out, these codes will help in the diagnosis of this problem.