i have a r33 1993 i have just but a fmic, t70, walbro fuel, malpassi rise n rate fuel press reg, 50mm external wastegate n a few other little things the car runs real well while driving and is extreamly fast but the problems is that when its on idle is sounds like a lumpy v8 and on the dyno its tekking me that its running lean there i have also had a fuel pressure reg guage on it and i seems that there aint enough pressure

can anyone please help me out asap

dont worry i found the problem there was a broken gasket in the catch can