I HAD TWO INCIDENTS OF UNINTENDED ACCELERATION IN MY 2012 FORD MUSTANG GT AUTOMATIC TRANSMISSION PREMIUM PKG. THESE TWO INCIDENTS OCCURRED ON THE SAME DAY MARCH 5, 2013. THE FIRST WAS AFTER I PICKED UP MY CAR FROM ITS GARAGE OF SEVERAL WEEKS AT LUNCH AND DROVE BACK TO WORK. I HAD GONE ABOUT TWO BLOCKS FROM MY GARAGE AND WAS BRAKING TO SLOW DOWN TO MAKE A RIGHT HAND TURN WHEN THE CAR DOWN SHIFTED AND ACCELERATED BY ITSELF WHILE I WAS PRESSING THE BRAKE PEDAL. I WAS GOING ABOUT 5 MPH WHEN THIS ALL STARTED. IT LASTED FOR ABOUT 3 SECONDS AND THEN THE CAR RELEASED AND STOPPED THE ACCELERATION AND I WAS ABLE TO SLOW DOWN AND MAKE MY RIGHT HAND TURN. I CONTINUED ON BACK TO WORK AND COMPLAINED TO MY CO-WORKER ABOUT WHAT HAD HAPPENED AND HOW I WAS BEGINNING TO BECOME AFRAID OF THE MUSTANG. HE IS MY WITNESS ABOUT THIS HAPPENING BEFORE THE SECOND INCIDENCE OCCURRED. LATER ON I LEFT WORK TO GO HOME AND ON THE WAY HOME IT HAPPENED AGAIN A SECOND TIME ONLY THIS TIME MUCH STRONGER. I WAS IN BUMPER TO BUMPER TRAFFIC GOING UNDER INTERSTATE HWY 820 BRIDGE IN FORT WORTH TO GO UNDER THE BRIDGE AFTER GOING THROUGH A TRAFFIC LIGHT ON EACH SIDE TO MAKE A LEFT HAND TURN TO GET ON THE WEST BOUND IH820. WELL BECAUSE OF THE TRAFFIC YOU HAVE TO STOP AT ONE LIGHT ON THE SOUTH SIDE OF THE BRIDGE AND THEN AGAIN STOP TO GET THROUGH THE SECOND LIGHT ON THE NORTH SIDE OF THE BRIDGE TO TURN LEFT. ANYWAY THERE WAS A LARGE SEMI-TRUCK HAULING ROCKS IN FRONT OF ME AND I STAYED BACK ABOUT 60 FEET SO AS N