Took it in for state inspection/oil change/new tires (ouch!) and the mechanic discovered that the plastic clip that holds the pullrod for the rear bank secondaries was gone, and the pullrod was just hanging loose. New clip fixed it in a few minutes and it feels like it's new again. Made a HUGE difference in the power over 5000 RPM. That's all it was -- a plastic clip!
Now up to 221,000 miles. Built June 1997; no idea which number it was. Anyone hear of a CSVT with more miles than that?