2nd Turbo Problems

[chrispy]

Hi there, just a quick question
After puting in a new engine into the car, when the second turbo kicks in it seems to dump the boost out as you can here what sounds like the dump valve going blowing air out and it coughs

Has anyone got any ideas? could it be one of the solenoid valves, or the coil pack breaking down so the spark isn\'t strong enough?? i\'m stuck

Cheers
Chris