I can't imagine what a spare nut loose under the valve cover would do.
But it would definitely NOT be good.
From what you are saying..., or from what I could make of what you are saying it sounds like rod knock is a possibility.
Hard to say.
The only thing I have had rod knock in was not a supra.
But it would stop at different rpm's and kick back in right around the same rpm level every time.
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