How do you fix an air leak and how much does it cost?

Can you be more specific about the location of the air leak? Do you have a check engine light on? If yes, have you had someone read the code and what is it? There are many places that could be leaking air - most of them vacuum related. The simple answer is to replace the leaking component - but that could be tubing, a gasket, charcoal canister, plastic intake manifold................................