Cylinder1 cylinder 5 misfire, pressure drop from 80psi to 0 psi

Pressure was dropping from 80psi to 0 psi while car was seating at idle. Run short test found faults for misfire on cylinder1 injector cut out and misfire at cylinder 5 and fuel delivery system.
that's their diagnose for the vehicle, and they are saying this is due to the wrong wiring between the engine and socket, and then cause the fuel delivery problem. They are saying they get the socket exchanged and replace the wire.
would the fuel delivery problem damage the other part of the vehicle? And they have the certificate for fixed the car, but I am still concern if any other problem would pop up.