2012 SCION IQ Vehicle Speed Control Problems

have a 2013 Scion IQ (auto/cvt). I had the 'check engine' and 'trac control' lights come on a few years ago.. I was driving on city streets. All I noticed was that the car didn't respond as it should when I gave it gas. ( nothing drastic ) I ran the codes. It said the gas pedal was the problem. I removed the pedal assembly. (it's easier to unplug it that way. I unplugged it and looked at the inside of the plug. All looked fine. Plugged the pedal back in and all was good then. (I'm sure I avoided a $500 bill ) Same problem just occurred a few years later. I didn't bother running the codes. I just unplugged/re-plugged the pedal. Saved another $500. Here's a scary one. I was driving the car the first light snow of the year. On a city street, going slow on level...

I GOT INTO 2 ACCIDENTS IN 3 DAYS WHILE PARKING INTO OR OUT OF A PARKING SPACE. THE FIRST ACCIDENT 07/04/2020, MY CAR WAS PARKED IN A PARKING LOT. I PLACED THE CAR IN REVERSE AND SUDDENLY IT ACCELERATED AND THE BRAKES FAILED TO WORK. MY VEHICLE ONLY STOPPED AFTER CRASHING INTO THE CAR BEHIND ME. THE SECOND ACCIDENT HAPPEN 7/7/2020 WHILE PULLING FORWARD INTO A PARKING SPACE, THE CAR SUDDENLY ACCELERATED AND BRAKES FAILED TO WORK AGAIN. I CRASHED INTO A CEMENT POLE WHICH STOPPED MY VEHICLE. I COULDN'T FIGURE OUT WHY THESE 2 DANGEROUS ACCIDENTS OCCURRED? MY VEHICLE WAS JUST REPAIRED OVER A WEEK BC THE CHECK ENGINE LIGHT AND TRACTION CONTROL LIGHT CAME ON. THE MECHANIC SAID THE PROBLEM WAS FROM A CATALYTIC CONVERTER THAT WAS CLOGGED, SO HE REPLACED IT WITH A NEW OEM PART. THE AIR CONDITIONER WAS BLOWING HOT ALSO, SO THE MECHANIC REPLACED...