88 gt will not crank!

I have an 88 mustang gt that i just cant get to crank, it just turns over and over. However it has ran for me. The timing is set right, its getting fuel and fire, new plugs and wires. Oh yeah when it ran it backfired really bad and didnt have much power. Well i know it is at least getting fuel to the injectors, dont know if its getting through them or not. Please help man im stumped.