I have an 85 Accord LX, carburated. Car began stopping intermitently. Now won't start at all. No spark from Coil. Seems to be getting fuel. Won't even fire on starting fluid. Replaced Coil. Replaced distributer with 2 different used carburators. 12volts to + and - side of coil with key on. When key cranking still have steady 12 volts + and - . What else is there to check? Thanks in advance for any help.