91 taurus tranny weird problem

Just drove my 91 wagon 500 miles. Next morning I'm in stop and go traffic in Miami and I stop for a light. Next thing I know I am revving in neutral. I push the beast out of the way, then started the car and it drove home (3miles) in second gear. Next morning I tried it out and drove fine for a mile or so then parked it. I didn't trust it to go further.
Anyone had this problem - what is it - electrical possibly or is it shot?

Thanks for any help.

robin

If your car is an automatic, have the transmission flushed and replace the trans filter. That should solve your problem