2 degrees means nothing to me with respect to the TPS, is it a 4x4 or RWD?
When you setup or diagnose a TPS it's usually done by checking the voltage so thats maybe the best place to start. See here;

http://www.bigturbo.co.uk/

and here

https://passionford.com/forum/genera...s-voltage.html

https://passionford.com/forum/ford-e...s-voltage.html

Not saying that's your issue but it's worth checking since it's free, also i suspect your CO is maybe too low so that's possibly an issue too but I'm not 100% on that.