Slow down there....

So when you turn the key, what happens exactly? Does it crank and then start and then die, or does it not even crank?

There are two basic things that run the car, spark and gas. It sounds like you've changed out most of the electrical stuff, so I'm assuming you've changed out plugs and plug wires. Another thing is to look for a disconnected or corroded ground wire or something like that. Also, have you checked that there is fuel going into the cylinder (or your fuel pump)?

Sorry for this really general answer, but it was pretty hard to read your post.