99 Caravan. Running very rough. Popping in and out of gear. Check engine light. Also sporadic electrical issues (cruise on by itself, radio not working, etc.).

Codes pulled. P0700 came up first (Transmission control module). Followed by P0740, P0715, P0733, P0732 (all various tranny codes).

Where do I start? Having trouble finding even a reman'ed TCM for less than $250, so I don't want to just replace this if that is not the whole problem.

Thanks for the insight.