95 SHO Transmission O/D Problem

This thing is shifting in and out of overdrive by itself.A couple of times the "check engine" light came on,and it ran Very rough,and smoked.The problem is,when I shut it off,it resets itself,and no codes show up when running test.I think it might be my speed sensor.Help!!! anyone.TKS

try at http://www.shoforum.com/ OR at http://www.shotimes.com. However, ur transmission could be completely shot :sorry: