keep it running?

What is your question?

My GTP at times will start fine but then die. It starts again easily each time but then dies. I've replaced the fuel pump, and the fuel pump resistor switch. There is no pattern. Sometimes it runs fine but sometimes it does the run and die. I let it sit for 20 minutes and it runs fine. I can keep it running by pumping the accelerator but if it falls below 2000 rpms it runs rough and dies. Have any ideas?