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I had the same SAI code problems.
I found that the check valve on my 2003 had fallen out of the rubber manifold. I fixed this with a brass barged fitting that I plugged into the rubber manifold and they used a piece of high temp silicon tubing to connect it to check valve.
I also found that the vacuum reservoir was leaking. This is a common problem. I tested the installed reservoir with a vacuum pump and gauge. It would not hold vacuum. A new reservoir is a little more than $20. I installed a new one and hooked up a vacuum gauge to the system and pulled 16 Hg to 19 Hg. Which is good and where it should be.
With these fixes my vacuum problems were cured.
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2003Boxster
1973 Carreras RS tribute
2000 Saab Aero wagon stick
1990 Chevrolet pu pre runner
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