93 will not start

I have a 1993 bronco 5.0 351 XLT. I bought thai car about 6 mounths agao. it ran fine for a little while then it just would not start one day. I know for a fact that it is receving gas and air and it is getting a spark. Also of the fuses are good and i belive all the connections are fine. I've tryed everything even quick start and still nothing. It cranks fine but just wont start. Someone please help me