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Sorry you are having issues with the AMG. You said this only happened one time? Did you happen to have a check engine light set, or flash during this event? Once you cycled the key did the prob go away?
Awesome, thanks for answering my questions. I know they seem kinda random, but they help me and give me a direction to go. This 100% sounds like a throttle body issue. These cars tend to act up exactly as you described when the throttle body gets hot and starts to short out internally. The computer sees a signal that is "implausible" and doesn't know whats going and gives you the exact situation you described.
I really hope this help (Sorry to the late reply) Please let me know if you have anymore questions and please do not forget to rate my service since that is the only way i get credit for my answer.