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I'm being told this problem is exhaust reversion. The service mech who took care of my car drove it and also drove another 2LT off the lot and both did the same thing. I also had another mech (used to be a GM service mech) drive it and he said the same thing, exhaust reversion.
With that being said, I was told the only fix for this is the use of counter weights on the exhaust and GM needs to find where to put the weights before they can send out a alert. Now is GM ( Jeff ) even looking at this as a fix?
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