Ray- I found this old thread from 2008 that talks about the vacuum and mechanical outboard carbs. Give it a read. Do you or did you at some point have the outer mechanical carbs with accelerator pumps? Or did you have the "Six Packs To Go" setup? It don't look like any of that stuff is available anymore that I can find. I guess what I'm trying to say is if your carbs had the "Six Packs To Go" mods and then were converted back to vacuum at some point, that may be why they are not working properly.
Mechanical vs Vacuum 6 pack setup