engine rpm surge. help needed.

[fixkick]

when you turn on the head lights and heater blower , (not AC) or shift to drive.
the ECU sets the duty higher, it opens the duty cycle in the ISC from say 50 % normal to say 70% or more to add engine power to match the added loads on the engine.
the method is called PWM (pulse width modulation)
all modern EFI cars do exactly this. (and is by law too. it must) the ecu controls idle , not people by EPA law. ( but can fail, easy , with vacuum leaks)
on modern cars add spark timing, (fixed and only ECU can set it) the CMP and CKP are precision machined and not adjustable at all on modern cars.
the ISC on modern cars has a learn mode and calibrates it self. and if it can not?, it puKES DTCs for the same.

knowing how it works is key to diagnose.
one key test is the pinch vacuum line test
smoke tests.
leak down tests with vacuum hand tool on all vacuum nipples, (all vacuum devices, even FPR,egr main, brake booster) even vacuum lines them selves can be tested with this tool.
in all comments, the idle switch is closed and reads 0vdc.
all.