Psi Loss

[stevet]

Hi guys my car with is currently losing about 5psi between the turbo and the engine. It has an HDi cooler kit and has checked ok for leaks. I understand as a part of a cooler working a cooling air a certain amout of psi is lost but this is too much and I think is causing problems. Also on stock tune it seems to have miss when accelerating hard as the auto changes 1st to 2nd and 3rd to 4th. Maybe that has to do with tourque limiting? As it almost has that feel to it. Any ideas would be great cheers.