to set the idle, there's a screw on the throttlebody. It's usually facing up, but sometimes it's facing towards the firewall. It's a flathead type screw, you turn it down into the throttlebody to decrease the idle, and turn it up out of the throttlebody to bring the idle up. After you're done adjusting, squish some grey silicone down into the screw, that'll keep it from wiggling back out of adjustment.

 

good luck with it