Well that small of a vacuum leak would not cause much of a lack of accelloration. And if the fault comes back the next day it is likely either a decent sized leak or whatever else can may affect the fuel mixture. Unfortunately it may take going into a shop for diagnosis with proper equipment. If you have a shop you usually use ask them if they have a smoke tester as nothing can find a big/hidden leak faster than pumping smoke out of it, and there is a vent pipe/hose that runs under the intake as part of the crankcase vent system that you can't see to check without removing the intake.

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2003 4.6is