Hello all: I've got an '81 280zx turbo (had it since 1998) and has been garaged for most of the time I've owned it, not to mention hardly driven in the last 20 years. But with springtime and mid-life crisis setting in I've had some renewed interest in the car I upgraded the turbocharger to a T3/T4 hybrid a number of years ago after the stock turbo died. I added a home-built intercooler system to it in the hopes of one day tinkering with the boost, but the rest of the engine and fuel delivery/ECU system is 100% stock and I've had little time to tune it (with three young kids and all). The car idles nicely enough but when I try to stomp on it while driving the engine sputters and backfires (sounds like a popping noise) through the intake and loses all power. We're talking about 2000-2500 RPM and the car will not accelerate faster than about 40-45 MPH. I suspect a fuel delivery issue (with the bigger turbo compressor). A fuel pressure test shows 30 lbs @ idle and 37-38 lbs momentarily when accelerator is pushed to the floor. But I don't know if that's enough to keep up with the air movement. Fuel filter and spark plugs are new. Any help with this would be appreciated!!