I'm not sure on a 4.6L. But don't get disilluioned about the adjustability of a TPS. You don't just turn a screw or somthing to adjust them. You have to bore out the screw holes and physically move the whole TPS housing to change it's setting. It is not that easy.
Basically you should be .90 to .99 Volts on your TPS as long as you are in that range (at idle) you're fine (4.6 or 5.0).
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