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Have a 2013 EzGo RXV rebuilt in 2013. The ride is interrupted by quick intermittent loss of power and it what feels like braking. It could happen 1 - 5 times in a mile or 1 - 5 times in quick succession. Have had in for repair 5 times at 2 different shops and no one can figure it out. Batteries check out ok. I’m at the end of my rope and would appreciate any and all help.

Did they replace the MCOR (speed controller) https://www.golfcartking.com/ezgo-parts/