Acting like one cylinder firing lean.

Other issues were from a thumpr cam that I first installed. It shaked like crazy so alot of it was replacing manifold gaskets incase their was a vacuum leak on the underside of the intake. Then I installed a new edelbrock rpm manifold. And the last was replacing the thumpr with a Voodoo cam. The voodoo cam is a big improvement except for the current problem with the misfire or lean spot at idle.
Every thing you speak of points to a vacuum leak, hi rpm @idle, lean - sorry. Have you measured vacuum at idle? are the secondary butterflies closed? What do the spark plugs look like?