wierd vibration sound from Holly Sniper LS Intake

[88Stanger]

So, I got my LS running good. Interesting little thing happened. When the engine is running there is a really weird sound, almost like a bearing is going out in say the Alt. or pulley until you lay your hand on the intake and "Poof" the sound stops completely. Must be one of the stupidest things I have experienced in a long time. It is just crazy. I know that some will say why worry about it, but it just bugs the ever living crap out of me!! So it must go away.
I have thought about trying sound deadener (Generic form of Dynomat) as I have extra. The other idea is to make some kind of a "brace" from maybe one of the bolts on the each valve cover up and over the intake and put a rubber grommet or ??? between that and the intake top.
Anyone every have this issue or fixed it?
Thanks for any responses.