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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
From what ive seen on most if not all 1999 trucks, is that vacuum port is not used and should have a rubber cap on it. With out the cap you have a major vacuum leak on the intake manifold.
On my 01' 4x4 auto it apears it T's and runs into a shieth with the cruise controle cable leading to an actuator. Prolly just caped for modles without.