still battling hard start/cold start - more info

[Keith Lawyer]

BRIEF REVIEW: my hard start/cold start problem is: after sitting for 4-5
hours or more, my '90 200tq is difficult to start regardless of outside
temp.  I must crank, stop, crank, stop, crank, etc... start!!!  I will
say that sometimes it idles very poorly for the first 10 seconds or so
once running.

NEW INFO:  I discovered that if I allow more time - approx 30 seconds -
after the first time cranking it fires right up on the 2nd try.  If I
wait only 3-5 seconds between attempts I must try several times, each
time with increased success until it finally starts.  What could be
happening during this 30 seconds after the first cranking attempt????
Once running I can kill it and restart easily until it sits for 4-5
hours again.

MORE NEW INFO:  I discovered I can reproduce the problem by pulling the
connector on the ISV and allowing the car to chug and die as a result.
If I then replace the connector, turn the ignition entirely off so as to
"reset" power to the ISV, and try to re-start I'm back to crank, pause,
crank, pause, crank, start.

WHAT'S NEW:  ISV temp sensor, coolant temp sensor.  Swapped in
different ISV from parts car, cleaned both ISV's w/carb cleaner.

ALSO: tried jumpering the fuel pump for up to 45 seconds in the morning
thinking I was losing fuel pressure.  I can hear the pump run and hear
things gurgle/flow up at the motor, but this makes ZERO difference in
the behavior of the hard start problem.

Any help is appreciated, I'm at a loss.  I can't seem to find any
problem exactly like this in the archives.  The car happily holds 1.4
and does not overboost so I'm ass-uming no vac leaks.

Keith L
'90 200tqa