Vacuum lines

[KBecker443]

I believe I have a Vacuum leak on my 99 24v, at idle when I push on the breaks the trucks idle drops and my cruise control no longer works, I’ve checked all fuses and no blown fuses, so I figured must be vacuum, anybody have a diagram or anything of that sort where all the vacuum lines run? 

[Ed ke6bnl]

even if you can not find the diagram, follow some of the lines, I had a couple of lines break near the firewall area that was an easy fix. the air conditioning vents did not work also.