Stumble at speed

["Paul Tegler " <wizardz@amdyne.net>]

Hey all you stumblers...
...got a new angle to look at tomorrow...
the cursing stumble might be caused by the evaporative
canister vacuum. 
Yes, the float bowls vent to this canister, and if it's clogged
you'll be applying a vacuum to the float bowls, starving
the carbs at higher speed cruising. (high vacuum state)

I wondered about this a month ago, and now hearing
someone else (John twist for that fact) suggest this 
possibility, really makes me wonder if it's really this simple.