I need help figuring out what's wrong with my car. I haven't been able to use it for over a week now. At first, I couldn't get the car to start at all. It would still crank but never start. I already got new spark plugs and fuel pump installed and now have a different problem. If I leave it in neutral and start, I can start it but within a second, it will die. If I was to leave it in first-gear and start it, it will stay on. The only thing my brother can think of it is maybe the main relay, something with the fuel or the timing. What do you guys think could be causing the problem? I really need to take care of this. Thanks