Swapped motors in 03 GT now it wont run??

1bad_stang

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Big Spring, TX.
My buddy bought an '03 GT w/ no motor. He found a low mileage used motor. We've seen it run in the previous car. We finally got it in the car and got everything hooked back up no problem but the car only runs for about 3 seconds. His predator is giving a 9356 code.(ignition run circuit open). What does this code mean? The original computer is still in the car and someone said he would have to get it reflashed since he swapped motors. Any help is appreciated. Thanks.
 
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SonicBlueOval

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Chattanooga, TN
He won't wont need to get the computer reflashed for the new motor, its the same motor so tuning will be the same. I would make sure all the grounds and wires are connected properly.
 

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