I WAS PULLING INTO A PARKING SPOT IN FRONT OF A BUILDING. I WAS GOING APPROX. 1-3 MPH DUE TO THE LOT BEING WET & HAD MY FOOT ON THE BRAKE. WHEN I WAS ALMOST TO THE CONCRETE CURB, THE TRUCK SUDDENLY ACCELERATED, JUMPED THE CURB AND HIT THE BUILDING. I STILL HAD MY FOOT ON THE BRAKE & SHIFTED INTO NEUTRAL. THE ENGINE WAS REVVING FULL THROTTLE, SO I TURNED OFF THE ENGINE. BEFORE MOVING, I CHECKED TO MAKE SURE NOTHING WAS TOUCHING THE ACCELERATOR, WHICH WAS THE CASE. THE AIRBAGS DIDN'T DEPLOY BUT THAT WAS BECAUSE OF THE ANGLE AT WHICH I HIT THE BUILDING. I THEN RESTARTED THE ENGINE AN BACKED OFF THE BUILDING. *TR