Crazy Idle Help Needed

I'm on a mission to get this bike on the road this month having just bought it as a project, turned out all that was wrong with it was the tilt switch (took a gamble and it paid off, never happens) so got excited and serviced it, new plugs, air filter, oil n filter, but when building it i noticed that some airbox hoses and plugs to be plugged in weren't undone by me, so i plugged in plugs, and 2 hoses into airbox, now it starts fine, and idles lovely for 10-15 seconds then it starts revving higher like way up, checked throttle cables, checked plugs, have i put in a hose that isn't meant to be in airbox?