2013 Kia Optima cruise control problems

The contact owned a 2013 Kia Optima. The contact stated while her son was driving approximately 35-40 MPH, the check engine warning light illuminated and was flashing; however, he continued driving the vehicle. The contact stated that she later took the vehicle to an independent mechanic, where it was diagnosed that the knock sensor and an unknown component needed to be replaced. The vehicle was repaired; however, 6 hours later while her son was driving 65 MPH, the vehicle stalled.

I was driving on the highway around 70 MPH, pressed the gas pedal and then the engine accelerated and then decelerated back to accelerating. By that time, the car lights on the dashboard turn on and the gas pedal would not accelerate the car anymore. The car slowly started decelerating on the highway, where I managed to get off of the highway into a dip on a big street. Had it towed because the car's engine would not start anymore, but the lights and radio inside would turn on.