I have noticed that my 1990 EZGO electric golf cart is starting get very sluggish when I go up slight inclines. I have been told that this is more than likly due to the controller going bad. 1st...is this correct? 2nd....how hard is it to swap? 3rd....what should I get? I dont want to spend alot of cash, nor am i looking to set any speed records, just a good factory comprable one. Any help would be greatly appreciated.