[nismo tuned s14]

i recently dropped a built ka with a greddy turbo kit in my car and when i rev it and let the rpms drop to about 1500 itll pop extremely loud. when i push in the clutch after boosting a little bit it will die. i have an open atmosphere bov but its never been a problem before. i dont have exhaust leaks and in not throwing and codes. my timing is where it needs to be as well. any suggestions?