ECU

[fixkick]

best i can tell 2D photos, (not 3D, LOL)! is
that cable is wrong, it must be set slack per the FSM. 10mm 1/2 inch. or it will never work right.
the TV bore must not be full of carbon blocking the TV from 100 (99.9%) closure.
the TPS idle switch must read near 0v, not 5v. pin 2 on TPS. (second pin up from bottom) use engine ground for other meter black lead.
http://www.fixkick.com/ECU/92-95MPI-eng-...e-huge.png

the TPS is calibrated using this pin2 switch. ( there are many many ways for the switch to fail) seen at below link.
for sure the idle racing is first. (or if closed loop fails running)

http://www.fixkick.com/sensors/tests/TPS...ml#freeze2

if the cable is set wrong , calibration of the TPS will fail , the TV most be 100% closed to calibrate it.
and the calibration off a bit causes 2 other problems (timed wrong)
early closer, and too late to open the switch. It cause hesitation in one case that causes the ISC servo to fight the drivers right foot, an ugly thing.

i'd calibrate it (tps)
cable set to spec, and TV 100% closed (examine it)
fiddle the bleed so the ISC wakes up and RPM hits, 800. and regulates. (test regulation with Head lights on, and blower at once is RPM held to 800? by ISC action)?
then set the freeze.
now the freeze works. (no DTCs live, ecu not in failsafe or backup mode (dead) as sometimes idle controls are canceled in these modes.)

the ecu controls RPM, not the bleed, the bleed wakes up the iSC, the bleed puts the ISC in the center of its range called duty cycle.
the 2 pin ISC are about 7vdc on the ISC when at 50% duty is hit (if meter works )