Bear in mind that it can still be very difficult to pinpoint leaks on the underside of the manifold with either carb. cleaner or water.

I experienced a fair sized leak that a casual spray did not detect. I found that you've got to get very close to the mating surface and suspect area with your detector.

I replaced the intake gasket numerous times and it would be ok for a month or two. But then the high idle would return. Ultimately ended up using gasket sealer on a new gasket to cure the problem.
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"Differences of opinions should be tolerated, but not if they're too different' - Sharon Craig