at a loss

i have a 1996 chev cavalier when it is cold and damp out the car dies and i hear an air leak on the passnger side of the motor when warms up it runs fine any help thanks

Start by finding the source of the vacuum leak, there's a good chance that could be your problem. What engine does it have? How long since it's had a tuneup? An codes?

Because of age, do a smoke test, see

www.youtube.com/watch?v=FfiQ7qWiG-M (http://www.youtube.com/watch?v=FfiQ7qWiG-M)