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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.
Other than affecting cruise control or vent controls, not much. If you pull the vac line of port on the intake , rpms will increase a little, then pcm will make adjustments to get back to target idle, like closing IAC plunger.