If it is what i am thinking man, It comes from the charcoal canister under the passenger fender. Should be under the hood over there. It has a 'T' connector coming out of it. Looks bout 3" long and 2" wide.
I did a '03 GT engine swap so I might have moved it some from it original location.
-Grady
yeah that is where the charcoal canister is and if you are looking for the evap purge valve then it is on the passenger side up under the hood behind the strut tower. it is about 3" long and about 2" wide and has a black padding around it. the purge canister is about 6" long and about 4" round. it is a long black canister.