Almost sounds like piston slap to me. The reason I dont think it is rod knock is when you revved it the noise went away. Usually rod knock will get louder and louder with more revs (just went through this with a Neon I had). Its a bit hard to tell from the audio but that is my thought. Take a long screwdriver and place the handle into your ear and touch the metal end around to various spots on the block. Use it as a stethescope. Its the quickest and easiest way to figure out where the noise is coming from.
90 YJ 5.2 Magnum, AX-15, 231 SYE'd
D44 front, welded/trussed AMC20HD rear. 4.56 gears soonish.
Western 6 lug aluminum wheels, with 35x12.50x15 Wrangler MTRs
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