Just finished putting the turbo on the 1990 240sx sunday night went to start it and the car was having trouble idling. After looking around I noticed that the BOV was leaking. I took the BOV out and the car idled fine at startup but when gas was applied in neutral and the rpms ran back down the car starts to have trouble staying alive real bad. The car had the same problem with the BOV on also. The car runs great while under load though.
Any ideas on what I should be checking for or looking for

I’m only running 3 psi right now on a t3/t4 with adjustable fmu as fuel management

Any help would be greatly appreciated

 

check for vacume leaks