Cart stopped running, then started again very slowly.

[BillyRay]

I have a 2000 club car ds 48 volt. VIN #A0041-946499. I have all new 8 volt batteries. It was running fine but all of a sudden it just stopped. I had to get towed back to my house. I live in a retirement community. Everyone has a golf cart. The cart sat all night. This morning with my foot to the floor it ran real slow, then spead up then slowed down then spead up again. Is it possibly the silonoid or controller or what?