Idle speed not raising on heat or headlights

[TracyDJMan]

here is the FSM factory service manual. 1page on top, no idea me what GEO is bucking facts.
Geo i guess flubs up and uses 1990 facts not real per below. 
when you buy the  ECU from GM/GEO the same exact SIDEKICK ECU is handed to you. So this below is fact.

It’s a Geo Tracker, vin 2CNBJ18U0M.  Spark plugs are new.  T stat is new, not overheating.  I am wondering if it is stuck in limphome mode or ISC stuck? It’s an on road vehicle. Nothing crazy,  been acting like this since I’ve owned it several years.  Heater is load/lights are load/steering is load.  Dips to about 500 and holds there.  If I turn off lights and heater and go for a drive, it will idle normal after. As soon as heater or lights come on, RPM drop. If steering wheel is turned left or right at idle, rpm drop.