1993 New Yorker, Over heated now the engine won't fire

I have a 1993 New yorker with 150k miles on it. The other day I was driving to work when the car over heated, I drove a few miles to the nearest exit and put water in it, and let it cool down. The engine turned over just fine. I drove it about 10 more miles to work with no problems, but when I left to go to lunch the engine would not fire, it would turn over just fine but no fire. It acted like it was out of gas. I put gas in it (simple solutions first), tried jumping it, and even put oil in it (it was a little low, though never had problems with it burning oil before). I was told that there was a sensor that wouldn't let the car fire if the oil pressure was low, I checked the oil and sure enough ti was low, but putting oil in it didnt help.

When I go to start the car the voltage meter (amp maybe? Don't know much about cars) only reads about 10, then drops to eight while trying to start, but it doesnt act like it is a low battery. The battery did go low after several attempts and two days of trying to start the car. Also when I go to start the car the oil pressure takes about 5 seconds to climb high enough that the check gages light to go off (when the engine is turning over). I'm not sure if this is normal or not. And finally it doesn't seem to be holding water, I put water in the radiator but when I go back it is low (but not empty) with some water in the overflow. Any help would be appreciated on this problem