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If there is no CEL, you don't have an air leak. The WIFI OBD2 is just a coincidence :P
However; It sounds to me like a MAF Sensor. These seem to fail quite a bit in boxsters, especially the pre-2000 models.
There are quite a few things it could be. But if the idle seems to hunt as you describe and occasionally find it's "proper" idle, then i would mostly likely assume it was a MAF sensor; especially without previous knowledge of the car.
Best of Luck!
~Brad
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