2018 chevy Suburban

[Cajundawn]

Just bought a brand new 2018 suburban. Third one, I also have two 2500  Silverados and a GMC Acadia . I have never had idle issues like I have with this new GM. The dealership is saying it's within GM specs.  Same with the fact that I can smell cigarettes stench inside my car from the people in the next car. THIS IS NOT NORMAL. I spent 60k on a vehicle. I own an independent auto repair shop. My husband is an ASE master tech. So we know a problem when it's there. There are no codes but it is there at every red light. I have never had issues before. Never smelled the smoke for the vehicle two cars up. I read all over that people are having the same issues as me. This is not acceptable GM!!