Hi Premier,
Welcome to this forum.
The 'two wire vintury on side of throttle' is actually a sensor providing throttle position to the auto gearbox. That switch has nothing to do with acceleration.
HOWEVER, if you mean the auto box is slipping and therefor 'no acceleration' then that switch must be reset.
The switch provides throttle position info to the auto gearbox in order to provide a certain amount of slip when selecting D or R. As soon as the throttle is opened a little, the switch will open to allow normal acceleration.
Rest the switch position to open sooner. There is a lot of info on this forum.
Regards
Chris