Mustang
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torque converter maybe, they are pretty sensitive. check your fluid if it hasnt been changed in a while and its brown i dont know what to tell you. you could change it. check for metal particles in the bottom of the pan. theres a magnet on the bottom of the pan thats supposed to catch that stuff.the guy across the road from me, his fluid in his a4ld was brown and i suggested to leave it alone that it could cause problems with a change. well he changed it and he couldnt even get it to move. he said the shop told him the valve body was damaged. not saying that changing the fluid was the problem. but if you do change it, better not to be able to move in your front yard than on the highway. a4ld trannys are pretty crappy imo, see if you can locate a t-5 and do a swap (or a c-4) if you want to stay automatic. are you running a 3.8 or a 5.0?
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Had a similar thing happen to my '92 E150 van. The trans shop said that water had leaked into the main wiring harness connector at the firewall, and had corroded some of the connections. They cleaned it up, and most of my problems have gone away. I think it needs a little more attention though, as I sometimes get a random downshift...nothing like it was however.
MR
MR