tech9,
I had a similar problem with my 280z. Started up fine, idled a bit, then would die. If I drove it before that there would be a plume of smoke following, and no power. Found Daeron's EFI bible post (http://forums.hybridz.org/showthread.php?t=135748&highlight=efi+bible) and found a bad temp sensor. changed that out with a new one, ran fine since.
Check out the bible, might be able to find your problem with that.