Rough idle and hesitation, symptoms of a vacuum leak but seemingly normal fuel trims?

Rough idle and hesitation, symptoms of a vacuum leak but seemingly normal fuel trims? - 1
Added (1). My car has had a very annoying hesitation / performance issue with a rough idle. It feels like bursts of vibrations when stopped (not a motor mount), almost like a vacuum leak. However my fuel trims are around 5-15% total fuel trim.
Added (2). I have no check engine light. I have also noticed sometimes when accelerating from a stop, the car has a very slightly delayed response and kind of jerks, and then accelerates.
Added (3). Today I have been smelling a slight gasoline smell outside of my car after I turn it on. Any ideas? I m pretty lost. Thanks!
Added (4). (Sorry, Y!A is screwed up and I have to post "Updates" with my info)…

One more thing, it's not a leaky injector (had them all checked and cleaned at a Honda dealer).

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