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afm /vaf testing- code 47

I have code 47 1987 EXP 1.9L HO EFI 5 speed. WHat I read for 47 is vaf sensor, ego sensor or 4x4 transaxle. aamco behind me says verify curb idle, check/replace isc actuator, and check for cable binding, which it has.
isnt the isc for cfi? i asked them that and they said they dont get asked that from alldata. Right.
So i still need to test the vaf properly. aamco said it has to be done installed. I saw videos saying to take it off and charge it with 12V. Other resources say use your multi meter.
problem is unstable idle and stumble on acceleration. Can anyone help? Thanks
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