WJ,

Yes a partially clogged could be contributing, but I don't think it would show up they way you describe. Is the ole' darlin' still hesitant to accelerate? Does it stumble and maybe "pop" when you snap the throttle open? I still think that if you have vacuam leak somewhere, it would effect alot of things, but it would effect idle more than anything.

Keep on pluggin' and Good Luck,
Larry