318 mystery problem, somewhat solved!

Neither do I with IAC but I'll watch it. I believe that it does close the IAC and then reopen it at idle but I'll have to watch.

Got a few responses on my post at cpgnation. Apparently the system doesn't like dual plane manifolds, I've got a weiand action+plus on there (dual plane) but likes single planes better, helps out at idle big time. So either I need to try milling out the center divider or a spacer. Think I'll try a spacer first before I go about ripping the manifold off and milling it out. Doesn't make too much sense though but I'm not too knowledgeable with this stuff.