Disconnect MAP sensor when using AlphaN ?

[Swede]

Thanks for your advices.
Yes, all runners are tied up to a common plenum. Do you know if plenum size matters ? Currently I am using a piece of a fuel rail as plenum (vaccum tank).
Maybe need a bigger tank ?

I also suspect that there is something else causing my problem and will look for vaccum leak. The reason I suspect this is that when I disconnect a hose to the plenum (vaccum tank) and thereby create a vaccum leak, no change in idle is seen at all.
Do you know if a leaking intake valve could generate a fluctuating map signal ?
The signal is fluctuating up to appr 3000 rpm where it becomes stable as a rock.

/Swede