Thank you for the update. I am truly sorry to hear this. We appreciate the feedback.So, quick update everyone. Long story short, GM says the rough idle and hesitation/lag of the transmission is "normal operation" for my regal. Wow! Great news! Glad to know it was just all in my head. They couldn't replicate the problem either and refused to let me drive the vehicle with the tech. Needless to say, GM has lost my business going forward.
Buick Customer Care