i dont know what the hell it is but sometimes i will be driveing down the road and the car will shift out of overdrive, i can pull back on the shifter (auto tranny) and it will shift back into overdrive but as soon as you let go of the shifter it shifts out again. i took the car to have the tranny servived and found metal flakes changed the fluid anyway and the problem is still there. i dont kow waht the hell is going on please help me