Just wanted to give a followup on this problem.
Got the Throttle Body Harness/Plug replaced, and it seemed to be
ok for a while. The Harness and Labor cost $670.00
But, it happened again, Reduced Engine Power on display, and
Check Engine light was on as well. I returned it to the Dealer, who
couldn't find anything wrong with it. Gees was I disappointed
after spending all that money !
If I would/could just operate this vehicle on the city streets, it
wouldn't be all that bad, just pull over and restart the vehicle.
That seemed to work (too get the message to go away) one
time. But, if I'm on the Freeway, and have to operate it at
10 mph, trying to get out of the way of high speed traffic...uooo!
I called GM about this, and they literally refused to comment on
it, beyond saying that an Overheating Problem could cause it.
Then, referred me back to the Dealer, who they said was keeping
all the "records" on that issue. BUNK !
The Dealer has NO idea of how to deal with this problem, or if
they do, they sure aren't telling me.
I'll probably be back on-line here to do followups as time passes.