Hi guys thanks for the add to the group. I’m having a real hard time trying to figure out what’s wrong with my 2008 GMC Yukon XL 5.3 4 x 4. I have a slight miss but no codes. I replaced everything in the evap system. Purge valve. Charcoal canister. Vapor canister vent valve. (Pump at gas station kept stopping while filling up). I tried a new throttle body. No change. I put new air filter in. I have a smoke machine. I have a creader scanner 123E. Any help would be greatly appreciated.