high idle= vac leak?
 

this is in regard to a civic turbo... my buddy was going in first then the rpm suddenly shot up to about 2-25 rpm and stayed there. he was able to drive it home but everytime he pressed the clutch in the idle stuck at 2-25... he noticed that when he let off the gas the bov whisteled even though he didnt go into boost at all. im thinkin its a vac leak somewhere but im not sure... suggestions?

ttt btw the car isnt throwing any codes