Accelerates and decelerates

Kia Sportage 1996  215000 miles
When the vehicle is stopped, it accelerates by itself till reaching 3000 rpm and then decelerates until it is about to stall. This happens time after time, what might it be?
Mur from United States 9 years ago  
MU
3 reports 
genie from United States 9 years ago
Every car tends to accelerate by itself when starting it; that is for the engine to get warm and reach the normal temperature, and then it decelates by itself as well. It is possible that the coolant temperature sensor is damaged or with a wrong connection.
Pete from Australia 7 years ago
We had the same problem... The car was 4 yr old, the fuel pump was on the way out it had to get replaced under warranty... Run great now.
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