Every vehicle I've had with a lockup TC has done exactly what you
describe.  That's normal.
--
Elbridge Gerry, of Massachusetts:

"What, sir, is the use of militia?  It is to prevent the
establishment of a standing army, the bane of liberty.  . .
Whenever Government means to invade the rights and liberties of
the people, they always attempt to destroy the militia, in order
to raise a standing army upon its ruins."  -- Debate, U.S.  House
of Representatives, August 17, 1789  

Bret,

I paid attention to my '99 K1500 with the 4L60-E while coming home tonight
on the expressway. If I let off the throttle while cruising about 65 mph
then press the throttle down to resume the speed the TCC has to re-engage
again. It takes something like 2 to 3 seconds from the time I press the
throttle until it engages again.
It's a pretty gentle engagement and I hardly notice it.

How ever my '94 Lumina Z34 you can feel the re-engagement very well. The
motor will actually rev up about 200 to 300 rpm higher than it was before it
locks again.

Brian

yes

it's a 'fuel economy' thing