I just bought a 1998 EZGO TXT golf cart and everything seemed great on flat ground. Brought it home to the mountains and when pulling uphill at full throttle it shuts completely off and stalls. Come to a complete stop and give it half throttle and it would go anywhere. Full throttle on flat ground was ok. Then today on flat ground I was moving at slow speed and gave it full throttle and it shut down again. Now it won’t do anything but shutter when I give it throttle. Batteries are 1 year old. Any help would be greatly appreciated.