I WAS DRIVING THROUGH A SHOPPING CENTER PARKING LOT AT A SPEED OF APPROXIMATELY 5-10 MPH, APPROACHING A STOP SIGN. THERE WERE ABOUT THREE CARS AHEAD OF ME. AS I APPLIED THE BRAKES, THE ENGINE SUDDENLY REVVED AND BUCKED 3 TIMES RIGHT INTO THE BACK OF THE VEHICLE IN FRONT OF ME. THE BRAKES WERE APPLIED THROUGHOUT, BUT DID NOT STOP THE VEHICLE. THAT MONDAY VEHICLE WAS TAKEN TO FORD DEALERSHIP AND THEY COULD NOT DUPLICATE PROBLEM, THEREFORE NO ASSESSMENT WAS MADE. THEY SUGGESTED THE AFTER MARKET FLOOR MAT I WAS USING COULD HAVE POSSIBLY BEEN THE CAUSE FOR THE SUDDEN ACCELERATION. I DISAGREE, THE FLOOR MAT WAS VERY HEAVY AND DID NOT SHIFT ABOUT AND WAS NOT IN THE WAY OF THE ACCELERATOR PEDAL; ALTHOUGH, I HAVE REMOVED THE FLOOR MAT. ANY FURTHER INCIDENTS WILL BE REPORTED. *NM