My series 1 r33 skyline with series 1 rb25det is got a problem. It idled rough on a cold start untill I give it some throttle. And randomly cuts out when driving around 2500-3000 rpm. It also stalled while idling last night. I've cleaned the aac valve and air flow meter. I've changed the fuel filter, air filter, o2 sensor, coil packs and put iridium plugs in it and it is still doing it. The cutting out is random as in, one day it won't do it, next day it will and it varies from one quick cut out to 5 or 6 times in a couple of minutes. It is similar to when a car runs out of fuel. Any help would be appreciated.