you can adjust it with guesstimates... or read the 4age workshop manual on how to set it... but i hate feeler guages so i just put a throttlebody on that had tps set to it since factory. honestly i think yours is working fine, and it might even be worth taking it to an auto electrician with a workshop manual (or a printed page from the pdf version).
just for fun, unplug the tps and go for a drive. I bet the problem goes away.
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