So after getting the truck back after being down 1month and paying for a valve job, the truck was losing it's idle. The engine runs 'smooth', but after about 20-30min the idle would slowly drop. I would adjust it up, but it would always move down. The weird part was the 'cold' idle stayed the same.

I took it back to the shop.....turns out the idle screw was moving.

Happy ending =)

Semper Fi,
Alfred
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'91 4Runner V6 4WD 400+K
'10 Scion Xb