'89 200 no start almost solved-need input

[Keith Lawyer]

After months of no problems my no-start condition
returned today.  First no-start today, I popped the
hood and simply began wiggling connections (hall
sender, etc).  The one that seemed to do the trick was
one of the timing sensors.
  Upon return to my driveway I left the car running to
pull the codes . . . while idling it died.  Hmm, so I
first swapped in a different fuel pump relay (being at
home I had more time and parts at my disposal), tapped
the coil, but again once I moved this wire for the
timing sensor it immediately fired right up.
  Here's where I need help:  the wire in question is
one of the three connections on the firewall bracket,
a white plug goes into a baby blue connector.  It runs
to the driver's side of the block (here's where my
description gets bad) and it's the one physically
furthest from the block.  It looks as tho if I
loosened the allen bolt I could rotate it, where as
the other connection down there is trapped between an
allen bolt and a "hard place" so to speak, it could
not be rotated if loosened.
  Is this making any sense. . ?  So, is this the RPM
sensor or the timing reference sensor?  Would this
cause a no-start AND dying-while-running condition?
  Finally, I tried pulling codes after it died and
would not restart but got nothing.  The check engine
light just stayed constantly illuminated after 5
seconds of cranking, then inserting the fuse and
removing it. .. 
  Motor is an MC2.

Much thanx,
Keith L.

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