96 Tracker hot idle issue (MAF reverse engineered!) look!

[fixkick]

The ISC has 1 more trick,
the ISC is not a thermal device, only electric. but it also heats the TB.
if the ISC dont heat fast , then the IAC warms too slow. im 100% sure this is not your issue but is one more ISC trick.

most isc that fail and cycle good can be readjusted, well.
the rubber ring seal was vulcanized on the metal seat (left side)
in the factory, it gets worn and you can compensate for this.
see the red arrow this part fits tight in the left sleeve and
takes persistent cleaning to get fully free. (here)
not carefully the balancing act with the 2 springs..!!!
der guts

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the goals are:
1: get rpm below 800 with ISC unplugged (and bleed closed) 600 is a good place.
2: this allows the ISC (ecu really) wake up, and start regulating idle above 600.. (right now, the ECU can not drop RPM ,so hunts , )
3 then trim the bleed for 800 and you should be near 50/50 duty cycle, close enough and then you can turn on all accessories and the ISC opens more, and idle holds.