[V8] Sensors? Still No Hot Start

[bw at UDel.Edu]

Hi, Only the guides on the plugs of the $33. sensors had to be reduced to fit my 
sockets.
I still have an engine that starts right up... And then, runs rich with an unburnt 
smell. After reaching operating temperature it can not be re-started. I guess the 
oxygen sensor failed prematurely, it even has a dent. Can a bad oxygen sensor 
stop ignition? It even runs like the timing was off, when ether is injected trying to 
start up when hot. My service manual for the new V8 states engine speed, coolant 
temperature, throttle position and intake air volume signals are fed to the ECU. 
  What sender could cause a no-start when hot besides the ref/speed sensors? 
Temp sensor when hot?
  The Hall sender controls the #1 cylinder injector timing, so could probably stop 
the injectors, if it is tied to temperature sensors. Has anyone had this problem if it 
was not due to the ref/speed sensors? It ran great not long ago.