New problems (read:Attn Unit, Merc, so on and so forth)

I really don't know if this will help but.. Some people have had problems with the edelbrock/bbk throttle bodies before... I have the same one you have and don't have a problem.. Its been said that drilling a small hole in the tb plate will solve 'the problem' but to tell you the truth.. I can't remember what the problem was.. maybe idle or the problem you are having. I also heard(years ago) the brass screw in the tb breaks off and ends up in the engine. Still, I have no problems with mine.

I tell ya, I just seem to be forgetting so much these days.. so much information though the years and I just seem to be losing some of the knowledge I once had(though I'm learning more).

Don't go drilling yet. If I were you I'd try putting the old tb back on(the price of a gasket and 15 minutes) and see if that helps, if it does... the tb may be the problem

I really wish I could help more.