There should be a little vacuum diagram on the front of the truck, just at the top of the rad.
Here's my diagram from another post.
1999 B3000 - Slight Jerking While Driving
The ones in heavy black are the main vacuum lines and are colour coded, at least on my truck.
What isn't shown is the one that goes to the dash, it runs over top of the exhaust manifold on the passengers side.
Do you have the vacuum harness that came with the truck, if you don't you will have to get one ?
There is a port of the back of the upper intake manifold that the harness connects to on the drivers side.
I'll be taking mine apart today and tomorrow, so I can take some photo's, but it won't be right this second.
We're 5 years apart, but it should still be about the same or enough to get you started if someone else doesn't post.
Also, don't confuse the DPFE sensor lines with the vacuum lines, the lines from the EGR tube to the sensor have noting to do with the vacuum line harness.
The lines to the DPFE sensor are made of silicon (so it looks like).