Have a 2000 F150 XLT 4WD 5 speed manual

All of a sudden it started doing this, it will start right up and idle forever, but
when you try to take off, it will die within seconds of moving. If you hit the clutch and let off the gas, it will idle and not die.

I have replaced the fuel filter and the fuel pump assembly and fuel pump relay.It still does this.

What is wrong? I am at my wits end. PLEASE HELP!!!

 

With no load on the engine will the engine rev up?

 

yes it would, but I found the problem, I feel like a fool.

When I was replacing the ABS module, I knocked the inlet tube off the intake.
This also pulled the black box on the drivers side of the manifold out of the hose in the back. Once I put it all back, it worked! The fuel pump assembly needed replacement anyway, fuel pressure was low (191000 mi).

I found it by accident when being all frustrated, I smacked the tube hard and then heard a sucking sound. Removed the cover over the intake and saw that everything was loose, hooked everything back and it was good to go.

Thanks again, I don't post here often, but you guys have saved my *** several times when I couldn't figure out what was wrong.