Except that it isn't literally "sticky". I cleaned and lubed the throttle cable, and it's perfectly OK as long as the engine is off.
With the engine running, when you're at a stop light the pedal gets "sticky" and requires a relatively hard push to get moving again.
Feels like you have to overcome some pressure [whether it's vacuum or positive pressure I don't know] that builds up while the engine is idling, and as soon as you have bled this off, the pedal behaves normally.
What could this be? Vacuum leak? Problem in the throttle body itself?