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Provided oil is nice and clean, guess would be the oil pump is dropping pressure because its going bad or it's not being spun. Personally, I'd break open the motor, I just prefer to see what's going on. If you want to poke around it a bit more first though, you can take the belts off to get less...

Do you still have stock manifolds? Sounds exactly like an issue I had. Heat riser broke and would rattle at idle and go away once the rpms went up.