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MAF - what should it read at idle?!

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Have a rather strange problem with my car. (MY05 987S with a 3.6 engine implanted from a MY05 997). It idles very badly, shaking like running on 3 cyls. CEL code appears within a minute or so, always the same - misfire in all cylinders (0300-0306). Already tried what I could: spark plugs changed, coils checked, MAF sensor and TB (e-gas assembly) cleaned, ECU connections cleaned, etc... Still no joy. No other CEL codes but the misfire. Tail pipe analyzer showed excessive CH (unburnt fuel). Under heavy load it runs fine.

Just checked with an OBD-II reader (Auterra Scantool) and found that MAF reads 3.8g/s at 670RPM - looks very low to me. How much it should be? Do I have a bad MAF sensor?! (Will try to read with Durametric but it's not here yet...)

Another symptom is TPS giving 15% at no touch on pedal :cursing: - tried to re-train the ECU but standard procedure did not help (battery off, 10mins pause, battery back, ignition on for 60sec, off for 10 sec, then fire it up and let it idle...) Maybe because of the custom software I have now in the ECU...

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