3.8 Mommyvan off idle knocking...

yeah, yeah, dont come knocking! No really, its making a knocking noise just off idle and when power braked to put load on motor. It idles fine, just a random knock and runs great on the road, no noise whatsoever. Just did a 800 mile desert round trip and no issues but its bugging me and my driver wife. I have heard "chain whip" but that sounds BS to me. If that loose, what would it hit and wouldnt it be worse at higher RPM's? or throw a code sue to timing fluctuations? rod knock (but only off idle?) water pump or idler? A/C pump (does it when A/C is off too) or bad A/C clutch? Replaced alternator decoupler already and seafoamed it today, cant tell if it did anything yet, but it was alot of fun! Idles fine, runs great. this is a stock pic but shows nothing the chain would hit to me. Where is the magnum Mopar tensioner! Can I get it this far down while its still in the 06 van? Seems this pic is missing half the chassis.
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