I don't want to come off like a jerk but I am suprized that there is a 400 out there, they were the first 2 cyl with CD ign and worked as poorly. Before you get to far down the repair road ome needs to tell you that parts for that engine are scarce and expencive. That said if the wires are already removed or broken, the only way i think you can iron out the problem is with a OHM meter and cking the ohms, it's gone to take some time but anyway here are the wiring specs. good luck
