Hi !
Turns out the cel wasn't caused by the plenum, but the O2 sensors, as it came back today, but just the P1128.
Since it's affecting only one bank and the car runs fine, I guess it's just the sensor (they are 13 years old now !).
So, guess what ? plenum is going back in as soon as I can
I still designed a new one, and I think you'll like it !
I'm getting used to the software:
Ben