Shortly after 3:30pm Saturday a car parked on North Avenue suddenly accelerated, jumping the curb, broke through a railing and crashed into a a car parked at  M & M Auto Repair located at 414 North Avenue.     Marcos Zasilva was inside M&M Auto Repair the accident occurred and said he thought something exploded inside the shop.   Assistant Fire Chief Ivan Fossesigurani of the Bridgeport Fire Department said the car knocked out a main  support truss making the building unstable until they get someone shore it up.  Fossesigurani said the driver of the vehicle was rushed to the hospital with non-life threatening injuries.