Fuel prime? Problems help.

[Stephen717]

Hi, I am new to this section but not the site, I have a 1997 GMC k2500 with a 7.4l V8. Since owning it I have replaced the tires twice, front brakes calipers rotors and lines up front (haven't done the back ones yet), spark plugs wires cap and button, ignition coil, ignition control modulator, fuel pump, fuel pump relay, valve cover gaskets, hard line going to one of the rear brakes, and headlights. We have since noticed that at idle in park or neutral it has a slight miss and since we replaced the coil, control modulator, and fuel pump relay, every once in a while when I start it it shuts off after a few seconds like it's losing prime, but when I start it back up it runs fine other than the slight miss which it's had since we got it. Can anyone help my figure out what's going on here, if so that would be great.

Thanks,
Stephen