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hmmmm.......for some reason, I don't think it is related to the tune, although the sound appeared after you tuned it.
I'd suggest you check the serpentine belt to make sure the idler pulley is keeping it tight. While you're under there, I'd suggest you check all the pulleys that the belt drives to make sure they are running true. Check things around the pulleys (like the shields) to make sure they are tight.
Has it been hot enough for your radiator fans to run .. ?? If so, maybe you picked up a stick or something that the fan blade is catching .. ??
humfrz
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