A Body Stalling at Idle

The mechanic and I both have seen a change in idle speed from NOWHERE, and with no apparent reason.......this too leads me to believe it is vacuum..............

I have asked him twice now to change the intake gaskets, but to no avail..........I guess if it's something he can't see, he won't move on it.....

He said he did a spray check with no results..........

Now tell me........IF the intake gaskets are the culprit, could it not be sucking air from the INSIDE with the same strange results? In such a case, it wouldn't show up with a spray test.....

....or have I taken too much Benedryl?

Seems an elementary possibility....................those gaskets are not new by a long shot, and the valve cover gaskets were baked on and leaching pretty well when I changed them...........