While traveling 80 MPH using cruise control, the vehicle speed suddenly reduced and several warning lights illuminated. The three warnings were Pre-Collision Assist Not Available, Service Engine Soon Warning, and Powertrain Malfunction / Reduced Power. The accelerator pedal did not work but I was able to coast to the nearest exit. I stopped, turned the vehicle off and back on a few times but the warning lights would come back on. When I shifted the transmission into Drive the vehicle would take off on its own. I drove the remaining 30 miles just letting the vehicle accelerate on its own because the pedal did not work. It wouldn’t accelerate over 35 MPH. The vehicle would still pull when I applied the brakes. Once home, I turned the vehicle off for an hour. When I turned it on the warning lights no longer illuminated and the vehicle drove normal.