Not sure if the 09 has the same engine as an 06 but the fix for this on my 06 is to wipe all the mystery residue out of the throttle body.
I remove the intake hose and use an old toothbrush and some papertowels. I hold the throttle open while cleaning as much residue as possible..(heavy black on the papertowel) I use some gumout too...the throttle begin to open/close smoothly without a sticky spot. It's solved the hesitation issue 2wice now.