With what you have said it could be a number of things, the best advice I can give you since it is so new take it back to the dealer and let them put it on the machine and see if the computer is trying to compensate for something, ie knock by retarting the timing etc. it could be something as simple as the car thinks it is smarter than it needs to be or that it being a new car something has clogged something like the injectors etc. At this point let the dealership deal with the problem and do not let them away with saying they cannot find a problem.
good Luck
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