1987 Wolfsburg camper hardtop, automatic.

We were N. of Mt. Adams about 4000ft  on a 90 degree weekend.
No warning lights came on but, I could see the engine temp was at the top
of the indicator light (riding high).
Driving downhill, the van suddenly dies.
We park, uncover HOT engine and let it cool for an hour.
It will start but not keep running.
By keeping the accelerator depressed it will stay running.  Right foot
accelerator- left foot brake.
A few miles later its running on its own.
All fine?
Head for home:  White Salmon to Washougal Wa  less than 100 miles.  HOT
day.
Started loosing power a few miles from home- died  a block from home.

This morning it starts right away and runs fine.
What the heck?

Thanks for any input!
Arlene in Washougal