2005 DS motor dies when accelerator floored

[omnimassage]

I have a 2005 Club Car DS. When I floor the accelerator pedal, it will go fast a few seconds, then die. When I let off pedal, and resume, without flooring, half way, it is OK. But sometimes if you keep flooring it and tripping it, then it will not go fast anymore and only go slow no matter how much you try to go faster. Then I have to flip the TOW/RUN switch under the seat, and it resets. Is this a MCOR problem, or?? If so, where is cheapest place to get another? I see lots of them for up to 2004 model, but not many for 2005 and up. Can you not use one for 2004? If this isnt the problem, what could it be? I am trying to sell this cart and need to know what to tell buyer. THANK YOU!!!!