The car was driven from Cheshire, CT to Old Tappan, NJ about 90 miles, just under two hours drive time. Combination of highway and back roads. The car was in drive in comfort mode proceeding slowly (approx 20 mph) down a street within a condo complex. As I approached the driveway I lightly braked, turned into the driveway then lightly pressed the accelerator to bring the car up the driveway apron onto the single car length driveway. At that point the car accelerated to what felt like max power. The car accelerated uncontrollably causing the car to advance in a right turn through the closed garage door striking a garaged vehicle in the right rear quarter and the right wall of the garage. Fortunately no one was hurt but this could have resulted on severe injury or death. No pre warning lights just a slight burning smell just before. This unrequested acceleration occurred twice before the crash incident leaving a traffic light from stop. Porsche has analyzed the car and find no fault. The insurance company has sent an adjuster. Damage estimated at $73,000.00.