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Lets start by assuming that the two problems are connected
and that the AOS may be suspect.
Have the mechanic remove the air intake tube and look at the condition of the throttle body. If the tube and TB are oil covered, then the MAF signals may not be bad, just unable to do their job controlling air/fuel mix due to the oil on the throttle plate. (Good cleaning instructions on Pedro's site)
I'm assuming you run a stock air filter and not an oiled replacement unit.
You didn't say (or I don't remember) how many miles on the engine and specifically the AOS.
It isn't a bad move to periodically replace the AOS. You may get away with the AOS, and the cleaning and not have to replace the actual MAF. Or it may be all of the above.
Do you have access to a Porsche mechanic who has the proper diagnostic equipment? Sometimes paying a bit extra there will save the costs of shotgunning parts until you eventually hit on the one that is causing the problem. Plus a Porsche mechanic will know exactly what to look for to pinpoint if it is the AOS that is at the root of the problems.
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