Here's some pictures of the early Toyota TBs. First one is the 3.0 the "idle adjustment screw" is on the side just behind the accelerator cable spring. The second pic is for the 22re, circled red, its on top of the TB. I was surprised years ago, when a mechanic friend showed me this. Being able to adjust idle on an EFI system, almost like a carb came in very handy.