The first time I adjusted the TPS sensor because it was idling extremely high and the person who bought it (less than 6 months, new at the time, ago) set it in exactly centered. At the time when I was adjusting it I simply messed with it until the idle was around 800 (which it stayed there for a long while). After sea-foaming my car, the idle was then instead at 500rpm (yet still idled smoothly, amazingly enough), so I bumped it back up. Yes, I do now understand that such function should be handled with that idle adjuster screw thing, but hey -- when I got this car I didn't know what a distributor was, much less how the EFI system worked
And finally -- yes, I am referencing the manual at
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/ so I hope that's the right one. I'll be going down the list, step by step, taking my time. I don't want to waste money on a distributor if it's simply a bad wire!