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If you unplugged that hose from the plenum and hooked up your guage there then that is the manifold absolute pressure (MAP) and is what the engine is pulling.
I didnt see one of your posts here earlier,
but the TEMP II sensor is located on the water bridge which goes between the 2 heads and has the large hoses which connect it to the radiator.
If you look at the passenger side hose, from the front of the car it pretty much points at the LH in the water bridge. It is a 2 pin Bosch connector. Now keep in mind the Temp II has 2 resistors in it and grounds through the body, so when checking it you will measure resistance between the engine block and each of the pics.
With your engine pulling 18-19 in HG (proper way to write inches of mercury) vacuum, then I doubt you have any air leaks in your manifold. As well, if the Temp II sensor failed then it would surge when cold but not when hot.
As to cleaning the ISV without removing the intake, the hose which you pulled off the side of the plenum for the vacuum check which leads under the manifold goes to the ISV. Some people have had success freeing it up (for limited periods of time) by spraying WD40 down this hose. However I think one would have more luck with using Brakleen or a similiar product which is ACTUALLY designed for removing gunk build up as supposed to a product which is designed to disperse water!
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