I have a 2012 mustang convertable. A while back when tacking a trip the car was throttling uncontrollably or not at all, turned out to be just the pedal and had it replaced. It was working for a while then it started to have issues again. Randomanlly, when driving the wrench light will come on and it will accelerate very slowly (foot to floor and it takes 5-10 sec to get to 20mph). It idles perfectly fine, and after you turn it off and let it sit it'll disappear. Car dosnt throw any codes...

2012 v6 Throttle Issue