U have the SCT tuner right? U have to get in contact with SCT. When I was returning back to stock I accidentally disconnected the tuner from the OBDII & my car wouldn't start. SCT had to connect to my computer & upload a stock tune on to my tuner & then I uploaded it to the car.
-2012 Mustang 5.0- Stock (for now)
-2013 Mustang 3.7 (SOLD)- Best 1/8: 9.057 @ 80.67mph