04 sonata p0452

have 04 sonota i get check engine light with code p0452 have put new Vapor Canister Vent Valve, Charcoal Canister Purge Valve Solenoid , i went and got junk yard charcoal canister with same results , when i reset the code the light will not come on when i cut the car off and crank again i get the check engine light 5 seconds after starting the car .Also i have put light coat of grease round the gas cap in hopes the issue was there any help would be greatly appreciated
thanks :banghead: