I wouldn't mess with anymore until you get the new temp2 and oxy sensor.
It's a classic temp 2 issue not starting when warm.
If anything just run the plug to the ECU following the pro training guide
and write down want you find.
Check the temp 2 when cold and check again when warm. I don't recall the
values but I have a little plug I made with resistors
that could be swapped in place of the temp 2 to "fool" the ECU into
thinking it was seeing proper values.
I just don't like playing "parts darts" trying to fix something as it's
possible to swap in a defective new part.
 The fact that it starts  cold and not warm. That it runs fine when started
is a definite sign of a temp related issue.
Running the ECU plug also checks your wiring to the various components.
My old 91 was purchased cheap because of a hot start issue that a new temp2
fixed.

Bill M

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