Won't Start. Mazda Millenia 2002. Replaced ignition distributor. checked wiring, fuel pressure, cylinder pressure. Mechanic says "might" be PROM ECM, not sure no guarantee. Is there a way to use a used PROM ECM from a wrecked car? How do I program a used part to match the key. Is it possible that I just need to get a new ignition key before I replace the ECM?