I have a 2001 chevy blazer 4.3 vortec. It has the problem where it won’t start very good after sitting for a little while. I just did a check at the valve in the engine bay and the pressure dropped about 8 psi from 54 to 46 in 10 minutes. This was after turning the ignition to on for a few seconds then off. I have replaced the fuel pump with an ac delco. I have also replaced the spider injectors, intake manifold gasket, and cap and rotor. This was all done to just get it running good in the first place. (Coolant was leaking throught the gasket into the oil) Once started or if starting after turning off it runs great. It doesn’t leak any fluids either. Looking into the intake it appears everything is still black and not cleaned by fuel. Fuel pressure regulator or maybe a faulty part? At this point i have no idea. UPDATE: gas definitely in oil. Dipstick smells like gas real bad.