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Re: Vacuum leak and the IRIS valve
two things:
1.- The iris valve is not a completelly sealed valve. It does not completelly isolate both chambers
2. the fuel injection pulse at iddle is not controlled by the O2 sensors; it's preprogramed on the ECU. That is why you have unstable idle when you realese the gas pedal and have a leak of vacuum.
Recomendation: replace all the vacuum hoses and the IRIS valve shaft's O'ring.
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