Mel- I emailed you a PDF file from Teleflex
with their contact info & installation instructions. I believe the Throttle Position Sensor is their gizmo or supplied to and thru them as part of the assembly. If it appears that is operating erratically and getting a replacement is an issue, we used to drill a small hole in the GM TPS body, fill it w/contact cleaner & drain several times, then let it dry out fully and try again. The rheostat can get gummed up.
I also sent the file to Linda to post on the Tech Library page for future reference.