I had that exact thing and ended up changing both knock sensors. Just light throttle would cause it to lay over. I monitered KR and I'd was doing the same thing. Seemed once it got past a certain point it would drop off and the KR would at least drop to the 1-2 range then stop and stay at 0. Then other days it was fine for most of an hour drive. It started to get to the point that anytime I pulled into traffic I would wait instead of chance it. The bog from a takeoff mostly went away but happens every so often. I've driven it about 75 miles so far. I still have problems with it laying over anytime I try to go into boost but that might be a separate problem.
Jeff