I tried to fix the Montero for several months back when I lived within biking distance of work. I spend hours and hours out there with the FSM and read everything I could find about the transmission electronics. Now it's my daily driver, and working fine. If I mess with it trying to fix an intermittent problem that hasn't showed up in a month, I could lose my only vehicle, which I need to commute. After all the tinkering I did with it before, I don't even know where I would start now- I've done everything I can think of short of tracing each wire from the trans to the TCM, and I don't even think I could do that.

Between this and the situation of having to get rid of one of my two vehicles, I am rather leaning towards the reliable one.