OK, here are my symptoms;
1. on a trip from Ky back home to Ohio (a few months ago) the truck at colder engine temps would stutter.
2. rough idle continuing stutter/check eng light(replaced spark plugs)
3. had the Advance Auto read the OBD and P0125, ordered and replaced then "cold H2O sensor" still stuttering when cold (its winter here in Ohio now)
4. installed Ultra Gage, cleared code, code came back cleared it again, cleared it again
5. I have the UG monitoring veh speed. Two days ago while driving back form a 120 mile trip the UG excessive speed alarm (I have it set at 71 MPH). The truck's speedo was at 69 mph the UG was tripping and showing 71 then 75 then resets. The UG speedo was bouncing all over the place ranging 10-20 variants of speed. The alarm would trip then reset but went off about a dozen times. Today on another 120 mile trip, the speed alarm went off the truck immediately acted as if it was slowing (like being on a rev limiter) and the UG alarm trip showing 107 MPH.

I am thinking Speed Sensor. Am I off my rocker or am I right.