[ChevyHighPerformance]

I noticed some of this and the PCM sees this too. When I'm going up a smooth winding hill (i.e., no washboard) at low-med throttle, I see knock retard (about 6 degrees) during each bend. During heavy throttle (not WOT) I don't see any knock retard on the same hill. I just assumed it low throttle, the three is a three way power struggle between the front wheels, rear wheels, and the engine and the torque transfer fed back as pulses into the engine creating some noise that was picked up by the knock sensor. During heavy throttle the engine won the power battle and front and rear wheels fought it out.