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There's wealth of info/lots of threads here. just search and read them to see if any relates to your car. Here's what I did.
Three years after I purchased the car (used 01 5 spd back in 2006) from Porsche dealer and with certified used car warranty, it started to idle rough. not ambient temperature dependent (Southern Cal is always summer) and dropped to 600, burped to about 900 rpm. before this, the idle was rock steady at 700.
I did the MAF cleaning, fair result but did not really cure the hunting.
Following another thread, cleaned the throttle body. The throttle body at the butterfly was really dirty and had built up a ridge of black goo. So for my car, the combination of MAF and throttle body cleaning did the job. It was not a vacuum leak.
you may want to test for degrading AOS and also wiggle the hose coming out of the AOS and into the manifold behind the throttle body for leaks
good luck
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