Saleen2004

Hi I bought a mustang Saleen from a guy in la and I was driving it home and the motor blew so I took out the motor and put in a non supercharged 4.6 281 motor in but put the stock supercharger from the other motor got it running and it's going into limp mode every time. I clear the codes with my handheld computer. Replaced maf sensor and O2 sensors and nothing is happening. Please let me know what it could be.