You can also try this:
http://www.amsoil.com/StoreFront/aef.aspx
I have a little more faith in Amsoil than in ATF as well. I've used this more than a couple times. You change the oil filter, put this in and high idle for 10-20 minutes, then change oil and filter as normal.
A guy on miataturbo.com sales Amsoil at cost, let me know and I'll get you his username.
I say this, but I truly believe it's a LE gremlin!
Chris