MY car would stumble only when kicking the AC on max from an idle.
The TSB was taken care of quickly and hasn't happened since.
That Focus board is full of typical car neophytes who will ask which washer fluid is the best and what they should use in their new hot rod. Overreaction is commonplace there.
If you want to drive one Brian, I'll let you try mine out next time it stops raining (if that ever happens)