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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.
You have a vacuum leak. Search for vacuum leak, and you'll find a bunch of different posts where people describe where they found their leaks. It can be hard to track down, but there are a few common places to start with first.
in the vac lines on passenger side near firewall is a check valve. its smaller than a penny only about 3/8" thick. it can go bad. there is also a vac resovoiur under the black plastic cowl on passenger side. it holds a generous supply of, well, nothing.....