2008 Nissan Altima fuel system problems

I pulled into Regions bank parking lot to use ATM machine and before I could even park my car accelerated for no reason. I had my foot on the brake but it just made it go faster. I crashed into the building and airbag deployed. This was the scariest driving experience I’ve ever had. The car is totaled and caused serious damage to bank. I escaped by the grace of God with sprained wrist and elbow and knee abrasions.

The following scenario has occurred 7 times in the last week.when accelerating from a complete stop rpms will momentarily increase to approx 2000 RPM then reduce to approx 1000. Engine. Continues to run smoothly with no lurching or jerking. The vehicle simply rolls slowly into the intersection or onto the roadway. No amount of manipulation of the gas pedal results in any throttle response. Placing gear shifter in park and shifting back to drive seems to restore throttle response.