SOURCE: 1989 GMC 2500 5.7L - engine surges and stalls at idle. Loses power at cruising speed.
Wow you have replaced a lot of stuff. Lets go back to the Fuel pump. When you replaced it did you replace the hose between the pump and the sending unit. These are common for splitting. Have you hooked up a fuel pressure gauge to check what pressure you have? It should be real close to 13 psi and should raise to at least 18 or 19 when you pinch off the return line.
SOURCE: Rough idle and acceleration on 1998 Chevrolet Silverado 5.0
Bad EGR valve comes to mind here. Assuming the plugs are good, the EGR valve woiuld be what I'd look at.
SOURCE: how do i change the intake manifold gasket
The intake manifold got nothing to do with coolant over heating if that is what you are talking about ?
SOURCE: fuel leak under turbo on 1997 ford 7.3
Is the fuel in the valley right under the fuel pump? If so, your fuel pump might have failed and is leaking out of the weep hole.
Other places to look would be the fuel filter seal and a bad o-ring in the fuel drain relief valve.
Good luck
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