Cam in my truck is actually very mild. It's a stock F-body LT1 cam (204/207@.050). If the cam was the problem, then the wideband would also be reading incorrectly. My wideband read it fine, and I could see watch the AFR spike lean before it stalled. FWIW, closed loop idle was unchecked in my factory bin. I turned it on to help band aid any issues with my VE tuning, but disabled it since it caused problems.