[Morgans] 1970 Plus 8 problem

[Robert Emory]

Good Morning!
Hope someone might be able to help with a problem
which has stumped me.
My 1970 Plus 8 starts and runs (and stops!) fine
for about twenty to twenty five minutes.  Then
the engine starts to run rough and within a minute
or two comes to a complete stop.
If I am prepared to wait about fifteen minutes it
will again start and run fine for another twenty
to twenty five minutes and then stall again.
This is not a very efficient way to get from point A
to point B so I seek the collective wisdom with
suggestions of what to check and what to do.
Thanks in advance for any suggestions, comments,
thoughts no matter how simple or complicated.
If you need specific information about anything
please just ask.
Thanks for reading and thinking.
Cheers for now,
Bob

Robert Emory
Barnstead, NH