If you don't own a code scanner, get one. They're inexpensive, and there may be a stored code that would shed light.
If you don't own a
factory service manual for your vehicle, get one. It will answer questions like the one about the TPS. Typically the whole set is about $100 or less. One of the most reliable vendors, other than Ford itself, is Faxon,
www.faxonautoliterature.com from whom I have bought many factory service manuals. Good luck.