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Those of us who have been digging in the SAI rabbit hole would tell you the problem is access. Renntech has some excellent threads with diagnostics. A lot of dismantling and part removal is required to do a really thorough job. Anything less may result in a re-do. Consider replacing all the vacuum lines with good quality silicone hose and brass fittings. There are 2 valves to check - buried behind the alternator and the vac accumulator(leaks in the base?)
One awful issue often overlooked is that the SAI ports in the cylinder heads can become plugged with carbon.
Good luck !
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