I'm now thinking there may be a more pervasive electrical problem
causing the Herky Jerky symptoms (chuggle).
The system voltage always shows up kind of ragged in the scans. Take a
look at this:

http://www.efsowell.us/ed/ParkAve/Fr...2006_04P18.jpg

Here are my notes on the episode shown the
+++++++++++++++
4.18: 12.4 minutes into trip. CC set at 66 mph, maintaining 67, TCC
on. Then
speed (or at least the speed sensor?) suddenly drops to 61. Throttle
opens (as it should
this time!) but seems happy to hold 61 mph for 8-9 seconds, why? TCC
stays on. Battery voltage looks rough throughout, between 13.4-13.6.
There were a few dives in inj. pulse width before and after the speed
fall
off.

suspicions: Since events seem to be preceded by drop in road speed,
could
it be a sudden increase in drive-train resistance? Or, ref voltage
effects
on speed sensor?
-----------------

Does anyone know if this kind of fluctuation is normal on one of
these GM CS-130 alternators?

Ed