Explor and Goose are right on. You need to test the sensor with the digital ohm meter. What you want to do is unhook the sensor, measure the resistance while watching the meter and slowly opening the throttle plate. The reading should go up and down smoothly. It should never go both ways while opening the throttle. The other thing is having the correct voltage for idle position. If the sensor passes the test, check for damaged wires and connectors. I guess I didn't know Auto Zone had "techs". I further don't understand how anybody could fry wiring clearing codes. Seeing as all that is involved is issueing a command with a scan tool, I say it is impossible to damage any wiring. The only way I can think of damaging wiring is if some idiot got to cutting and splicing, or the vehicle in question already had serious problems to start with.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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