A few weeks ago I bought a new Impala LTZ. I just took it for a trip to CA for the holidays. So, I left when it was still dark. I noticed that the headlights and dash lights were noticably flickering. I thought is was maybe because I had my cell phone plugged in or something. Anyway, what I finally discovered is when the engine goes into 3 cyln mode, the lights flicker and continue to flicker as long as it stays in 3 cyln mode. As soon as it goes back to 6 cyln mode, they stop flickering.
Any of you 07 Impala 3.9L owners have this problem? Any of you techs heard of this? This cannot be a normal thing. Looks like I'm headed for a trip to the service department.