swinging idle and stalling while driving
 

Hello,

another challenging issue with a 95 porsche 993 Carrera;
idle swings a lot when accelerating, and the car often stalls when driving fast as i release the clutch; it's very dangerous because as the power cuts, the breaks and the steering becomes suddenly ineffective.

i scanned the car many times with PST2, without pulling any error code;
i swapped from a clean car, idle valve, MAF (air flow sensor), flywheel sensor,
but nothing changed.
i checked all the vacuum system, and checked tightness of all hoses; nothing
i checked the exhaust for leaks; still nothing

I only noticed that when the MAF is unplugged, the car seems to idle better but not perfect, with always a kind of rebound when the rpm comes back to 900.
i will try again another MAF and will test my alternator charge signal.

the only weakness i know of this car is the clutch which seems to be shaky, but the engine is fine.

I'm getting short in ideas

O2 sensor?