I actually have a question. I just replaced the evap canister on my 07 impala. I started the car and the check engine light is still on. I already tried the gas cap and this is an evap leak diagnosis. Do you have to drive for awhile before the light goes off or do you have to reset somehow? If the latter, how? I don't see how I could have messed up the install and a gear head friend of mine did the diagnosis. I'd ask him but I am pretty sure I have been getting on his nerves so I want to wait a couple days in calling him about it. Anyone have a suggestion? Serious replies only and thanks for reading this post