I have been reading alot of posts adn there are quite a few that are talking about a plenum! what is it? were is it? cuz i have a leak of some sort and i was just wondering if this may be it!

 

Here is the TSB dealing with a leaking plenum:

http://dodgeram.info/tsb/2000/09-05-00.htm

Also try searching for plenum, you should find enough threads to keep you busy for days.

 

it's on the bottom of the intake manifold... it bolts up to it and there is a gasket that will leak because the manifold is aluminum and the cover is steel... they heat and expand at different rates causing the gasket to tear and leak.