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I battled long and hard with SAI issues. I did lots of research and checked/upgraded lots of parts. My conclusion was that:
first you need to do a thorough diagnosis.That is awful because it is so tedious but do it anyway because if you miss one leak all your work is wasted.
Second , do everything because access is so awful - how many times do you want to remove the alternator and maybe the Intake manifold?
Third, upgrade to silicone and brass.The cost is trivial and it will never fail.
Invest in a smoke machine or at least a Mighty Vac to test your work. Become a Master at using both otherwise you will be down the same rabbit hole endlessly.
Rebuild the SAI pump
Clean out the ports for the SAI system in the cylinder head.If they are plugged with carbon, no amount of other work and expense will be effective.
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