I'm working on a all stock Silverado that all the o2s will randomly quit reading, and the truck will start chugging bad. if I keep the rpm above 2,000 they will start to read but once I let off they go dead again. sometimes if I tap the throttle I can get them to come back alive and read again. they are brand new gm o2 sensors all 4 and I ordered a new pcm and flashed it thinking the driver inside was bad but the new one does the same thing. ill post the log see if i'm missing something or give some guidance on what else to check cause right now i'm scratching my head.
thanks in advance