Hey Trooper Girl,
As of right now, my tranny seems to be doing great. Seems like the solenoids made a huge impact. Amazing that it took 2 months just to indentify it, after so many processes of elimination...when it could have been eliminated just by replacing two solenoids.
I have a check engine light on right now, but I know it's the CO2 sensor, and now I have to figure out how to replace it/them.
My transmission issues started with the fluttering you're describing...it did it from 2 to 3, and then when my car would go into OD, it would do it then too...sometimes so hard that my dash would rattle. They rebuilt my transmission and it fixed the problem (the first time). They told me that transmission pan looked like a chia pet.
By the way...Isuzu wont allow their dealerships to rebuild transmissions...they are instructed to replace with a brand new transmission due to so many of these issues. Interesting...I wonder if it's just 'easier' for them that way.