Car was running fine, then just stopped in road, had to be towed. Deville will not start, no fire (spark)to plugs. Receiving 12 volts to distributor cap. Have replaced Distributor cap, rotor and ignition control module. Also replaced Ignition coil and pick up coil (850 ohms to coil). VIN#60696A9106592. Local parts men and local mehancics baffled why there would be no fire to the plugs. Plugs and wires checked out fine. Any idea why vehicle will not start? Battery and all grounds check out OK.