I have a 2002 Kia Rio Cinco, I haven't had any issues with the car for months, until now. I was driving out in the country, and the transmission SUDDENLY quit working. I went to accelerate, put my foot on the gas pedal, and the engine just revs, and the RPM gauge jumps all over. Got it off the road, and tried it in every gear, R, D, 1, 2, the motor just revs, it will not go anywhere. It has an automatic transmission, did the transmission go out, or could it be something simpler?