Hello everyone I'm new to the forums and I really need your guys' help. I recently bought a 94 full size blazer and it won't shift automatically by itself. Previous owner said motor and tranny had been rebuilt. He said it's the torque converter but I'm not exactly sure. Overall the rig runs great. I can shift it manually myself and it shifts smoothly but I want to find the exact solution. Engine light is also on but I haven't checked to see what code it's throwing. I'd greatly appreciate any input you may have. Thank you