I have an 08 Club Car DS. A week ago the cart started giving me problems. Would accelerate to about 8 mph and then hold. No faster. Sometimes it would surge but back to slow speed. Did the test on the speed sensor and it acted like it was bad. I replaced the sensor but still the same problems. It won't beep or try to slow when rolling downhill. Is the mcor next? If so, can I test it? Thanks for your help.