2012 Precedent issue: Cart is Stopping and going...jerky like.

The MCOR was replaced. Volt meter read 46.4 when this started happening.
Batteries are new Trojans.
10" wheels and tires, no lift.
Voltage drops to 35 volts when pressing gas.
New Plum Quick Bandit Motor
Stock Controller/Solenoid.
Any first thoughts?
See video below:
http://vid293.photobucket.com/albums...psch7ygs4f.mp4