'89 S10 4.3 erratic idle speed

[76C10Stepside]

I ended up finding a way to test the output voltage by inserting a piece of thin wire. Even though the TPS passed the resistance test with flying colors, it failed the output voltage test. Bought a new one at Autozone, but the harness plug would not plug in all the way, and it did not work (looked like a cheap rebuild, had plastic shaft that probably would have broke eventually). They didn't have another one, so I got my money back and bought one at O'Reilly's, and that one works.

Next step is to figure out where the coolant temp sensor that sends to the temp guage is, guage stopped registering at all awhile back. There's one at the front of the intake manifold (somebody said that's the wrong one?).

Pretty sure my C10 has a spun bearing, so real happy to get the S10 back on the road.