need help asap ! D16y4 turbo

hi guys i have an ek with a boosted d16y4 block, 510cc injectors, to4z turbo, front mount, all internals done its worked off its head. the car was driving fine until yesterday. all of a sudden it wont go into boost and it feels like its chocking/ cutting out. i thought it might of been either dirt fuel or spark pligs so i gave it a service today and changed it all. still doing the same thing. any suggestions or someone had the same problem?
muchly appreciated if you could help !

Pm user Grifty, he is Dseries specialist on the forum

Boost leak? Are all your boost/vac lines attached? Then start with the normal diagnoses procedures on fuel and electrical and go from there