97 Blazer needs help!

I was driving down the road and my car tried to die and caught itself, about five blocks later it shut off and would not restart. I have changed the fuel filter, crank sensor, distributor cap& rotor and it still will not start. It does have fire. It turns over but will not start. Please HELP!!!!

Fuel pressure needs to be at least 56 psi to start. Preferrable more but it absolutely has to be 56 psi! Check the fuel pressure and see where your at.