My 97 SHO has a temperamental tranny. Some days, it works beautifully. We replaced the VSS and Transmission Position Sensor switch, but some days I need to drive it like a manual running from 1, D and OD, or the motor seems to spin and the car barely moves. At first I thought it was trying to start rolling in the wrong gear, but I do not believe that is the case. My mechanic friend hooked it up to a computer and the transmission seems to be doing what it is told, we are just not sure why it periodically misbehaves. Torque converter? Thoughts? TIA!