I'm with Mach 1. If it's sticking it's more than likely build-up inside the TB, IAC motor or maybe a bind on the throttle cable. It's and easy job to remove everything from the intake and clean it all up with carb cleaner.
Get new gaskets while you are at it because they will more than likely tear coming off if they have been on there for awhile. You'll need the IAC gasket, EGR gasket, EGR spacer to intake gasket, and TB to EGR spacer gasket. Get some good stiff parts cleaning brushes that are pretty small to get inside all the components and get all that gunk out of there.
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