Has this been tried to calibrate the ECU and pedal?
Turn off all electrical components.
Turn the ignition to the ON position so the dashboard lights and chime come on(Do not start the engine).
Wait until the chime stops.
Smoothly depress the gas pedal to the floor while counting to 5(1001, 1002,...).
When the pedal reaches the floor slowly release it while counting to 5.
Count to 6 after the pedal is fully released.
Turn the ignition to OFF.
Count to 6.
Repeat the procedure 2 more times.
Post 18 at... https://www.allfordmustangs.com/forum...se-gone-2.html
2011 V6 Mustang - Premium
Sterling Gray Metallic, Charcoal Black
Automatic, 2.73 Rear
Comfort Package, Camera
AM/BAMA 93R Tune, K&N Drop-In, Roush Axle Back