Ive been having trouble with my 280z. My last Z was a 72 240z so fuel injection was pretty new to me when I started working on this. Ive been slowly learning the nuances to the L Jet system. The problem was a bad idle and not staying runnning. Old owner said it had bad gas in it so I dropped the tank and looked in and there was an inch of sludge. I rinsed all the sludge out of the tank and treated it for rust. Tank was perfectly clean when I put it back in. I also put in a new fuel filter, fuel pump, and just to be safe I swapped out the injectors and rail for the fuel rail and injectors from a running car. I also blew out the lines. Car still ran like crap. I got a fuel pressure gauge hooked up and my pressure is around 30psi to 28psi. Ive replaced the AFM as well. Car starts and idles around 1600. Idle drops after around a minute to 1k. Sometimes it holds sometimes it drops to 800 and gets really rough and dies. I drove it down the road once and under load it stutters hard and I hear a pop from the intake. After checking my plugs they are white. So my best guess is im leaning out somehow. Ive checked for vacuum leaks and couldnt find any. Any help is appreciated thanks