Okay the car has been down without power for 5 years I recently finished the car and started it car runs fine until you put it into gear then instantly it won't take gas and dies. I've went over all my wires everything is plugged in where should I go from here? I can start the car in neutral with the ebrake on and it sets and runs fine I release the ebrake wheels start to turn and car shuts off.

With this being said do you think the computer has lost its tune or? Any answer I would be grateful for thanks