Engine Clicking And Tapping Noises problems of the 2006 Ford Taurus

After taking a right turn, the vehicle began accelerating on its own. I had to fully apply the brake to maintain control. It was terrifying. My whole body shook. I thought I would hit something because I did not think that I could stop the car. Even while pushing the brake pedal all the way down and shifting into d I could not keep the car under 40 mph. The engine kept revving and the car kept gaining speed. Luckily, the only light I had was green. I pulled into a parking lot and slowed the vehicle down to a stop by applying all my force to the brake. I shifted into park hoping that would keep the vehicle from moving. It caused a loud sound that sounded like an explosion and startled everyone in the parking lot. Still not sure what to do, I turned the ignition off. A parking spot opened up so I turned on the ignition, that caused an even louder explosive sound. I was still terrified but I had to act - so I forced the brake pedal down as hard as I could and shifted to d and was able to navigate into the parking spot. I put the vehicle in park again and again it caused a loud explosive sound. By now I was a spectacle in the parking lot but I was just thankful that I was alive and that no one was hurt. I looked down at the gas pedal and noticed that it was fully depressed and loose. I pulled the pedal up but there was no tension to hold it up and it dropped back all the way down. I drove the vehicle back home, in much the same way - transmission in d, applying a lot of force to the brake and hoping that I would not have to stop suddenly or get pulled over for speeding since I could not get the vehicle slower than 40 mph even while pushing on the brake as hard as I could the whole trip. And when I parked the car at home, it made the same loud sound and I also heard ticking noises coming from under the hood. I am still shaken up by the incident.