I just went through this last year with my 05 Tahoe and it was the vent lines like everyone else is saying. Gotta drop the tank and blow the lines out or replace them. I replaced mine and the charcoal canister and it fixed the issue.
My new Yukon is doing it as well when its cold outside so Im gonna need to do the job all over again.
My new Yukon is doing it as well when its cold outside so Im gonna need to do the job all over again.
