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Are you sure the wideband is correct. if the engine has fuel and doesn't seem to misfire there is no reason for it to quit running, unless the compression was failing.
Do you know how widebands are supposed to work? Have you ever had one before? Is this your first wideband? If you've never tuned a car on a wideband before, my bet is the wideband isn't working and you are being fooled.
Not making fun of you; I've come to plenty of cars whos owners were telling me over and over that there was plenty of fuel, why doesn't it run? I get in the car and the wideband is dead as can be, the owners had no clue. They don't tune the car so they didn't know I guess. It would just sit there at some number 14:1 or something. It isn't supposed to do that; they respond fairly rapidly to changing conditions and jump around quite a bit. You should be able to reduce fueling and see the wideband report the change dramatically as the engine begins to choke from lack of fuel.
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