86 4kq dies while moving

[drmarino@juno.com]

My 86 4kq developed a problem of dying as I was driving. This happened
the last 3 times I drove it. It has been at the dealer's repair shop for
almost a week and they tell me they can't find the problem. At first they
had run it on a lift for several hours without the engine quiting. Then
they test drove it for well over 1/2 hours and still no problem. Finally,
it did stall out on a test drive. They cannot as yet find the problem
because it is intermittent. The car has 234+ k miles on it and has been
serviced faithfully on schedule by the same dealer. No one else ever
worked on the car. The service writer told me the car runs very well with
no signs of any problems - except of course when it dies. When it quits
it may or may not start up right away.
I realize no one can give me an answer to this problem. However, if
anyone has had the same problem and discovered the solution I would
greatly appreciate hearing from you. Obviously, I can go the route of
replacing parts one by one but that can be very costly as well as
frustrating.  Also, it is very dangerous to drive the car in this
condition since it just dies without any warning whatsoever (e.g. no
vibration, engine cough, etc.).

Thanks in advance for any insights.

Dom

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