When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
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.
Where does that vacuum line go? Truck idles extremely high, could this be the cause?
It's certainly a cause of a high idle, and it's also probably leaning out the mixture. I'm not sure what would normally go there, but in the meantime, put a cap over it, until you find the proper connection.
That conection may feed the vacuum line that handles the vent ducts on the inside of the truck. Connection may go from there back towards the firewall.