Discovered a leak in the intake manifold in a 2003 Merc Grand marquis. Put a new dorman intake manifold. Now I have a crank/ no start situation. There's no injector pulse or coil sparks. I have checked the crank sensor and cam sensor. The first test showed a fuel rail sensor, but even though I replaced it, it's still showing fuel rail sensor and still no spark or injector pulse. Double checked all the plugs. HELP. ANY IDEAS/ SUGGESTIONS??