Look first. Look by the Evap canister (little round black thing near the middle of the firewall. Should have a vacume line running to it. Make sure they are all the way pushed on. Check your spark plug wires also. If you can get the car to run spray the lines down with carb cleaner. IF you hear the idle raise you've found your leak. It's either going to be a hose that's dry rotted or a hose that is not connected properly.