Also check the power brake booster hose for leaks, leaning out #4.

I diagnose egr this way. Using a 3/8"npt tap, I block off the egr passage and trash the valve. This only works in no smog inspection jurisdictions...

Seriously, the vac hoses are VERY easy to screw up, and no really good diagrams in the FSM. I have managed to straighten some out before, but it took hours with both diagrams and the truck in front of me. Lotsa little hoses and nipples and lectro- and thermo-valves in there...

Not responsible for advice not taken...