Major Misfire

[Nitronige]

Can anyone help?

The car has developed a major stutter/misfire when changing from the first to second turbo.

Has anyone had this problem??

I have replaced HT leads and spark plugs recently, so don\'t think that is the problem. I have also recently replaced a majority of the vacuum hoses under the plenum. Boost seems to be ok.

This weekend I will be removing the twins to sort an exhaust leak, could the leak be the problem, even if the boost is fine? I will also check the actuators while the twins are out.

Any advise is greatly appreciated.