1996 Nissan Maxima keeps dieing

My car starts, and then it has very little power, sometimes it dies, sometimes, it will go along fine. At red lights it dies, and it takes about 3 times trying 2 start it, b4 it will finally stay running.I have changed the fuel filter, and air filter, still does the same thing. It bogs down, goes very slow. Seems like if I turn my ac off, it helps, I am a single mother w/ a 9 yr. Old child, I am disabled, and have no money, to take it, to a mechanic, I cry all the time, this car has been one thing after another, PLEASE HELP ME, I DO NOT KNOW WHAT TO DO! I WISH I COULD DONATE, I REALLY DO, I AM A VERY GIVING PERSON, BUT I DO NOT HAVE ANY MONEY, RIGHT NOW, I DO NOT RECEIVE ANY CHILD SUPPORT, DEAD BEAT FATHER!