Final update-problem solved. Incredibly it was "none of the above" for the problems and solutions. It was an adjusting screw for the secondary butterfly-it was loose and vibrated itself loose enough at WOT to idle at 4000 rpm. I took it apart today with intent to replace what I thought was the broken part and realized what had happened. So I adjusted it correctly, this time with Loctite thread locker, installed it and it runs like a champ, with the stock fuel pump. Thanks to all for your help. I've attached two photos to illustrate. The first one shows how far open the butterfly was, and the second shows how high the screw was. So, if any of you that have a Weber 3236 installed on your ride ever experience an extremely high idle for no apparent reason, check to see if the secondary butterfly is closing completely at idle.
secondary.jpgscrew.jpg