i started it one morning and it started and then died. ever since then it wont start. it almost catches but doesn't start. i changed the spark plugs and wires and battery and distributer cap.

I have spent too much money trying to fix this car but it is the only vehicle. I have replaced fuel pump, fuel filter, and fuel regulator switch. I can not afford another car. It doesn't start in the morning but it does in the afternoon. I don't know what is wrong or what to do. Someone PLEASE HELP!!