yeah i read the post before the last and im thinking the fuel pump is dead. it supplies enough fuel to keep the car at idle, but when you want the engine speed to increase, which in turn demands the injectors fire more, which in turn is demand for more fuel, it will cut out and bog down under a lean condition. I sure its the fuel pump, i have went through this a few times on my Z's. When you change a fuel pump, you should also change the fuel filter with it.
Good luck.