Based on on input from this group, I had my auto transmission fluid changed
at 150k miles...probably the first time it had been changed. The oil was
quite dark. Driving the car afterwards I did notice it shifted a lot
smoother.

Recently however, when I come to a complete stop it takes the car a second
or two to shift back in to first gear. If I press the accelerator nothing
happens then it catches with a thump...obviously not too good. It doesn't
shift like this all the time, only occasionaly and usually when cold.

Any ideas what causing this...will it get worse...and preventive
measures...and finally, worst case scenerio, what am I look at for a
rebuild? Thanks!