PRIOR TO THIS INCIDENT, I HAD NOTICED SEVERAL OCCASIONS WHERE THE ENGINE WOULD SUDDENLY REV FOR NO REASON WHILE I WAS DRIVING AT A SLOW SPEED OR BRAKING. THIS INCIDENT HAPPENED ON DEC 2, 2014 AT APPROX. 7:40AM EASTERN TIME. AS I WAS APPROACHING THE SECURITY CHECK-IN GATE AT MY JOB, TRAVELING ABOUT 10 MPH, I DEPRESSED THE BRAKE TO SLOW DOWN AND WAIT FOR THE GATE TO OPEN. AS I WAS SLOWING DOWN, THE ENGINE SUDDENLY REV'D TO MAXIMUM AND THE CAR ACCELERATED AND LURCHED FORWARD. I WAS NOT ABLE TO STOP OR CONTROL THE CAR AND IT CRASHED THROUGH THE SECURITY BARRIER GATE. NO ONE WAS INJURED AND THERE WAS NO DAMAGE DONE TO THE CAR, BUT THE METAL ARM OF THE GATE WAS SEVERELY BENT. I TOOK THE VEHICLE TO MY SUBARU DEALER SEVERAL DAYS LATER TO BE INSPECTED AND REPORT THE INCIDENT. THE DEALER SAID THERE WAS A PROBLEM WITH THE ENGINE CONTROL MODULE (ECM) AND UPDATED THE SOFTWARE. SINCE THEN, THE CAR HAS RUN SMOOTHLY WITH NO FURTHER ACCELERATION PROBLEMS. THE ECM UPDATE ALSO SEEMED TO SOLVE A PROBLEM I HAD EXPERIENCED WHERE THE CAR HAD DIFFICULTY STARTING UP. *TR