4KQ Stall like turning off igintion key Quattro digest

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Having both an 87 and 80 4000 I had some bizarre " like turning off the
ignition key" symptoms.
One was under the dash area by the steering column in the vicinity of the
ignition switch.
In this area I found an inline fuse capsule which was white and had a fuse
inside it.  the capsule halves were loose and I was surprised that the
little fuse capsule could shut down the car.  I had it happen while driving
and the other car had a "sweet spot" along the steering column where I
suspect a similar thing was happening..  Since long legs can brush some of
the wires under the dash above the gas pedal something may have been
disturbed.
The other was a loose battery cable both pos and neg each different times.
Also check the ignition switch. Hope this helps.

Sudden loss of power happens quite often in my experiences: teach her how to
control the car and maximize her safety in moving the car safely out of the
way before she stalls out in the fast lane.
-Scott in BOSTON

My wife and daughter were driving home last night when
the engine died in my 1986 4k-CSQ.  My daughter said
it was like turning off the ignition key.

I am thinking it may the Hall sender in the
distributor.  I have not had a chance to look into
yet, but I would welcome any speculation.  The car has
 almost 250K miles on it and we still love it.  Thanks
in advance.