CAR WAS ON THE HIGHWAY DOING 65 MPH. WHEN I TOOK MY FOOT OFF THE ACCELERATOR, THE CAR CONTINUED TO ACCELERATE ON ITS OWN. WHEN I APPLIED THE BRAKES I WAS ABLE TO SLOW IT DOWN AND CONTROL THE CAR. WHEN I GOT OFF THE EXIT RAMP AND TRIED TO BRING THE CAR TO A STOP, THE ENGINE WAS RUNNING AT HIGH RPMS AND I COULDN'T COMPLETELY STOP CAR UNTIL I REAR ENDED ANOTHER VEHICLE. I'VE TRIED TO START THE CAR AFTER THAT, BUT THE ENGINE IMMEDIATELY STARTS RACING AS IF I HAVE MY FOOT PRESSED ON ALL THE WAY DOWN ON THE GAS.