I originally asked about the magnet, but now I have removed the old one and installed a new one. Now I wait for 24 hours. I tested the old one with a screwdriver and didn't detect any magnetism
I put the throttle position sensor back in, adjusted it for 0.42 volts at idle. It didn't make any difference.
If I set the voltage a little higher, would it speed up the idle? Not that I want to do that, just curious how it works.