So I'm just getting this thing idling and driving down the road, made some adjustments, downloaded everything to the emulator then all of the sudden, my MPH starts reading the same as the TACH, then stops. As I go for a drive, no VSS reading in tunerpro, and no transmission shift. It's a 4L80E and a 7060 PCM. Did I just witness something in the ECM committing suicide or did the VSS itself just die? Oddly enough the electric speedo still works.