207 1.4VTi cold running problem

[MarkandCath]

I have cold running trouble with the better halfs 207. It is a 2010 1.4VTi. It hunts at idle and runs on kangaroo juice until it warms up.

No codes but I think I have found an issue in Live Data. In the picture you will see the revs going up and down OK but the pressure in the manifold remains constant at -1270. It does move plus or minus 3 or 4 but basically it is a flat line. My understanding is this is measuring the vacuum in the manifold and that it should alter with the revs. Have I got that right?

I have cleaned both the throttle body and the MAP. Air temp looks OK. Any ideas would be appreciated. Cheers.

[PaulC5]

You could unplug the MAP sensor and see if it improves as it puts the car in limp mode with a fault code.

Apart from this is the servicing up to date with spark plugs replaced as required ?