A word on the throttle position sensor.....

These do go bad. But they can usually be rebuilt. For those reading here and trying to deal with the same decisions as the original poster the info on rebuilding these, or even for current owners, is worth knowing.

The main thing to know is they can be popped apart and the interior metal runners made accessible. There they will either be dirty, which is what you hope the problem will be, or they will be worn through, which is what you don't want to see.

If they just need to be cleaned start with some electronic cleaner and then try to polish the runners with the same cloth you would use to police jewelry. Then put the thing back together, which is easy, and you are good to go.

If the runners are worn through a pit of foil tape over the worn spot will get you by until you can find another TPS.

I have opened these up and found them to be defective right from the factory. And yet they were still working after 40 years. So they are hard to mess up while being assembled. Just a bit of care is all it takes.