Duramax Third Generation: 2006-2007.5 (LBZ & LLY)
I have a bit of a weird one. Was driving home from FL to Canada, A/C on 24/7. My alternator died and stopped charging the batteries. Made it to an auto store and changed it in parking lot.
For the next 8 hours, it seemed to work fine but then in stop n go traffic in Detroit, it starts to bounce...