I just got this 2008 Club Car 48 volt golf cart. It seems to accelerate and run fine when I first push the peddle. But as it builds speed, it cuts out almost like it is coasting. I can pump the accelerator pedal a couple of times and it picks up again. When climbing hills, it will slow to a crawl but when I pump the accelerator, it will pick up again. Any ideas what is going on here? Not sure how old the batteries are but they all show 12.5 volts....total out put is 50+ volts.