2014 Subaru Forester electrical system problems

On Friday, 12-3-21 I was in an accident in my local Costco parking lot while backing out of my spot. While backing out of the spot slowly with the wheel turned, my 2014 Subaru Forester had a sudden and extreme acceleration in reverse doing a reverse u-turn into a parked car causing considerable damage to the rear end of both cars. I am certain that I did not to press the gas pedal as this is a busy parking lot and I always back out very slowly just covering the brake.

This problem has been getting progressively worst. The car has been having troubles turning over on cold starts, and has experienced a loss of propulsion and stall going up hill including a loss of brakes since I bought it a year ago. On 9/6/2014 the car was started and was idling high (approximately 4000RPM), check engine light was on, speed control light was on, incline alert light on, sport mode light was on and check emissions system light was on.