I couldn't tell you how old they are or when they were last changed. I'm just trying to work out what all this data means before I start throwing parts at it. The trims don't look steady at all. Maybe once I do a fuel pressure and compression test, that may shed some more light.

 

If you have over 100K miles on your truck, you should really consider replacing the sensors.... (assuming other tests come out ok.) NTK, or Denso sensors only though. Skip the bosch sensors, our trucks don't like 'em.