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Hi, my name is ***** ***** will be assisting you today. Does there happen to be any warnings or lights on in the dash?
Ok, this is a common issue with either the throttle position sensor or a faulty electronic throttle plate. Usually a warning that says ASR or ESP accompanied with a "check engine" light would be the symptom. I would suggest you leave the key in the "on" position with the engine off for 5 minutes to see if the problem is fixed. If this reset procedure on the throttle plate/motor does not work, it may have to be replaced after the fault codes are read.