I'm assuming this has never happened before with your car?!
When my 93ATX started going out (a day after that Aamco power surge of tranny fluid

) it would ride fine, actually better than ever before, but then would only accelerate in 1st gear only sometimes, and would get stuck in 3rd or 4th gear and I would have to get off the gas to let the car slow down back to 1st so I could get'ur moving again!
I would say check for oil in your plug wells, but man, I rode for a few years with my oil wells filled.
Just keep notice for another week before doing anything! But, keep that highway assistance &/or local towing company # in hand just in case!
Also, if your car stalls at a stop, make sure your O2 sensors are good, i dunno....
Paid $1800 flat for my rebuild!