Very strange, everything looks good except the O2 volts drop to zero. /ubbthreads/images/graemlins/dunno.gif
You aren't getting any CEL codes? It would seem to indicate an injector/fuel issue, as you said. The PW and Hz look great, but the O2 sensor isn't indicating that there is enough fuel. Do you have any way to watch the fuel pressure while driving? Do you have an AFC?