I was backing out of an outdoor shopping center slot located at the end by the curb. I had to attempt this three times due to traffic and another car that was also trying to back out. On my third attempt, I hit the curb with my passenger rear wheel. When I changed gear to move forward, the ID4 jerked violently three times. At this point my hands were on the wheel and my feet were not on either the accelerator or the brake. Immediately after the third jerk the engine revved up and car took off. I tried to brake but was flying over 2 curb hit the road and flew over 2 more curbs with plants in the middle. The braking did not stop the vehicle. Coming up over the last curb the vehicle hit a parked car sending backward and it hit 2 more vehicles. No one was injured, since the vehicles were empty. The police did come and wrote an incident report, but not a police report because in California since it was property only they do not generate a report. However, this could have been fatal since people were waking about the parking lot. There were not any warning lights or messages. It has not as yet been inspected by by anyone . The car is available for inspection at a collision center. I am not sure which component failed and why it accelerated, or did not respond to the brake, or deploy the air bag upon impact.