2001 Bmw 325i

could anyone help me out with my problem . i got 2001 Bmw 325i it has 122,xxx already the car run smoothly , i have this starting problem issues in my car , it start in one second and dies. Recently changed my fuel pump,o2 sensors upstream and downstream,fuel filter,spark plug,battery,air filter and i just clean mass flow sensor,Check the crank case or oil separator too they look fine no leaks no damage or anything, when the car get warm up he sounds good, but when u put in drive the idle drop and dies, all vacuum hose are new , after that i went to Autozone and clear the codes, after 20 mins ses lights came back again code are po174 po171.