I found the Ambient Air Temp Sensor! 2008 ProStar...

[marek4792]

I notice on almost every truck including my Volvo has them on the front a Cascadia I drove had two of them right next to each other, I wonder if this would cure rough idle and surge I have had even after putting new injectors and actuators in. On insite mine seems to be stuck at 72°F but I'm not sure if it's part of the mandate d€l3t or not?