2005 focus 2.0tdci No boost when cold!

Hi Everyone! I have my 2.0tdci focus that i got for £400, i have replaced 4 wheel bearings, 3 abs sensors, a flywheel and clutch, alternator, battery and a lower intercooler pipe (from intercooler to inlet manifold). In the mornings i start her up so it's nice and warm before i set off for work and during the initial acceleration it spread out bluish smoke and there is not much boost, i had a fault code that was "supercharger/turbocharger under boost" but assumed the burst intercooler pipe was the culprit... Turns out I was wrong! When it's cold it takes a good 10 seconds to pick up to 3000 rpm and it's near impossible to get off the line during that time, I've spend a fortune on this car and the body is extremely good condition which is why i want to keep it! I have given it a full service (oil, air and fuel) 4k ago and it made no difference, i appreciate any feedback and i hope someone has had these problems and solved them before!