30coupe1

I have a 89 5.0 with a vortech s trim. The car ran and then i started to have problems with idle and it starting. Now the car will not start. I have spark at the plugs. I tested fuel pressure and the first cycle of the key i only had 11psi, each cycle of the key it build more until it stopped at about 42psi. But the pressure bleeds off. Isnt it supposed to hold constant? The car has a t rex helper pump with the vortech kit. What could cause a no start like this? Please share your imput.