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when it is running pull the disptick and see if you get vacuum and if the knock stops. If the pcv isn't working right it will be sucking in air like crazy into the cranckcase. I had the exact same problem and it was a pinched pcv line. My fix was putting on thye LS6 PCV system. Well worth the money IMO.
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-Nick
9/11/01- Never Forget
2002 Pontiac Trans-Am WS6 # 206
Chasing 10's
469RWH/437RWTQ
11.05 @ 123
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