Don't fret yet. This is going to be an easy fix once we nail it down. There is only so much that could be causing the vacuum leak, which is causing the hunting idle.
Check to see that the drain tube out the bottom of the air box is plugged. It is supposed to be plugged to keep unfiltered air out and to keep oil blow-by and other crap contained until the rider can properly drain it.
Take come WD40, while the bike is running and spray different parts of the intake system. Feel free to be liberal with the application. If you spray the WD40 over any area that is sucking in air and it shouldn't be, the idle will change. This can help you zone in on where the leak it, at best. And, at worst, you have a clean and shiny carb and hoses
Have you had the carb removed or worked on lately. There is a thin rubber diaphragm in the top of the card that often gets squeezed or pinched when people are messing with their carbs. (How me how I know. And ask me how 3 hours and some epoxy took care of it.
Start there - it'll tell you a lot. Let us know.