after a few minutes of my transmission running my car wont go in reverse whats wrong?
If it's the torque converter lock up solenoid, it starts killing the motor at stoplights. That's the only one I've ever seen that malfunctioned, and it was a pretty common problem on the mid-80's GM products.
May need to buy a new solenoid.
transmissions specially newer electronic transmissions have multiple solonoids , and if it is OBD II - 1996 and up it should illuminate the service engine soon light