STARTED HAVING ISSUES WITH ENGINE SHUTTING DOWN WHILE IDLING AND I ALSO HAVE A V

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VEHICLE HAS 6400 MILES ON IT, STARTED ACTING UP JUST BEFORE 64000MILES. WHEN STOPPED AT LITE OR JUST IDLING IN DRIVE ENGINE WILL SHUT DOWN AS IF IT HAS CHOKED OUT. DOES NOT DO IT WHEN VEHICLE IS IN PARK, ONLY WHEN VEHICLE IS IN DRIVE OR NEUTRAL. HARD BRAKE OCCURS OFF AND ON BUT WILL SOMETIMES GO AWAY IF I BRAKE HARD.