Having lived with this very same problem, I have found that nothing short of
a complete rebuild on the auto trans section will cure the cold hesitation.
With that said, I have been living with it what will soon be 4 years. I
changed fluid and filter every year. I use mobile 1 synthetic atf fluid and this
seemed to moderate the
problem. I let the van idle for two min before I move and have not had a
problem.
     For what it is worth.

Right now I am fighting a bad water pump. Does not leak but lots of noise,
shaft is real loose. Will post the end result

Jim Morgan 86GL
"Breadbox" 208,000.0
Westlake,Ohio