My son's 2015, BMW 328i was taken to BMW in Canton, Ohio due to "fluttering" in gas pedal and "possible transmission slipping and variations in transmission while driving. The check engine light was on and was diagnosed at dealership that the Mass Flow Sensor was malfunctioning. The wires to the Mass Flow Sensor were corroded and needed fixed before sensor could be assessed. The wires were fixed and the check engine light went out so the car was considered by the BMW dealer service department to be fixed and I paid $545 for $42 in parts and $503 in labor. The service advisor named Mark, assured me that it had been test driven by service technician and that the car was in proper working condition. I picked the car up, for my son, at 10 am and drove south to West Virginia to deliver the car to my son. At 12:15, I pulled off the freeway and stopped at a light that was at a busy intersection, with a car in front of me. I came to a complete stop with my foot on the brake and my car accelerated at a high speed with my foot completely on the brake almost to the floor. I rammed into the car in front of me and the car flew forward 500 feet. My BMW stopped after it hit the car in front of me. I sat in the car in shock with my foot still on the brake as the driver in front of me came to my window and asked me " what the hell are you doing"? She could clearly see that my foot was still on the brake. There were minor scratches on her bumper and, her and her son had sore necks. The fro