Does it have headers or an exhaust manifold? If it has headers you can you a pyrometers to check the exhaust gas temps when it's knocking at idle to see which cylinder is causing the problem. I'm assuming that you already pulled and read the spark plugs. It sound like you are confident that it's not a mechanical knock and could be detonation.
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2007 C6 z51 416ci, KW variant III, Wilwood WS6, Traqmate.
2005 F-350 PSD 4x4 DRW Lariat
2013 Mustang GT Grabber Blue, track pack, Brembo, Recaro, 3.73s
2009 Jetta Auto 2.5 liter
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