Hi I need some help, while driving in 3rd or 4th with the torque converter locked up hit a large bump it will unlock let off the throttle and get on it again re locks. I have a lock up switch will not do it when the switch is on. could this be a TPS issue? or something else, bad connection ?solenoid in the trans ?. I was going to install a pot and see what that did. Any ideas would be appreciated thanks Trevor