Car randomly died while driving, won't start back up.

What is your question?

I have a 1994 mazda protege dx 4 cyl. and i was driving one day and it just died out of no where. i pulled over and walked to the gas station to get oil, because i was low and thought that might be the problem, so i poured oil in and tried to start, it will make the noise like it wants to start but it never turns over. a mechanic tested it and said it was the engine coil, i paid 80 and got one and this was not the problem. I do have air in my car, ive read about an air flow sensor? i dont know what that is. a couple people said it might be the fuel pump also. Just trying to get some ideas.