96 olds cirea

Try checking the coolant temperature, throttle position and vehicle speed sensors-

Also I'm not sure if its the computer or a harness .the transmission guy said its not in his field the transmission is not the problem but something in the electronics relm is not letting it shift. Has any one had this happen. It feels like I'm pulling slit of weight n then once its running it just won't shift. It will go fast but just won't go into over drive.please help I have a family disabled and no money really