Quote:
Originally Posted by shadycamaro
@Yohan
The way this car gets it's higher mpg is thru AFM "active fuel management". It's genious & crap at the same time IMO. The car drops from 6 active firing cylinders to 4. So at low torque & heavy curb weight... your now trying to move this car on a 4 banger rather than a 6. That causes the lug & when radio off the chatter/vibration noise from below (2nd thru 3rd gear).
As I stated before I have had this issue in many GM cars. You can complain till blue in the face, nothing they are going to change or "fix" from factory standpoint.
Good luck! 
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Umm the 6 does not have AFM. I don't know where you got that info. Only the SS L99 with auto transmission has AFM.
Mine does not vibrate or chatter at low RPMs and neither did my 2010.