ok....i have a turbo'd single cam and the car has been running great.....im using stock injectors with a FPR at about 40 lbs of pressure,ive been running it this way now for quite sometime...im boosting at about 7lbs but just recently my check engine light came on and the car started running really lean just outta nowhere,i changed my fuel pump and filter but its still running the same...im scared of detonation and im very curious why this is doing this.....also the check engine light has only came on like 2 times outta the 5 ive driven it so far like this...also its a 43 code which is fuel supply system...

can someone please tell me why my car is running this way,also the car runs great still....