So i had my emission light turn on in my o5 f150 with a 4.6L. I had it checked out on my buddies tester and there was a couple of codes and 1 of them was unabable to bleed up fuel tank pressure! The other was system 1 bank 1 too lean. If i take off the fuel cap it wants to die and there is either alot of pressure build up! i bought a new cap and didnt seem to help. I dont know if i should try the Evap Canister Purge vavle or if i buy the evap canister if it will have it on it? And i have no idea where it is located any suggestions would be nice!

 

This could be several different things. What were the exact code numbers?