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I had a MAF problem on my 2000 2.7 recently. It ran dog rough
I took it to the local Porsche dealer who told me to replace the MAF, they told me that the ECU adjusts itself to the readings of the faulty MAF and alters the mixture to compensate. To reset the ECU you just need to unplug all the cables from it and leave it a little while then plug it back in again. It then forgets the previous settings for the old MAF. The ECU is behind the rear bulkhead lining in the trunk. Once disconnected and reconnected it will begin to recalibrate itself to your new MAF. Porsche mechanic said it takes about 200-300 miles for it to re adjust itself, so to expect it be a bit lumpy for a while. Its runing fine now after 500 miles. Did you use a dodgy aftermarket MAF off ebay or is it a Bosch after market one or a genuine Porsche one? apparently it makes a big difference.
the chicken noise sounds like the ring gear on the starter motor not disengaging quickly enough. How long has it been doin that? was it since you changed the MAF?
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