[tempfixit]

Have you removed the vacuum line from the Fuel Pressure Regulator on the fuel rail to see if there is gas in the line???

For a flooded engine you hold the accelerator pedal to the floor , this disables the fuel injectors.

You could also have a injector that does not shut off flooding a clyinder. Does it seem to mice at times??

Is the Check engine light on ? If so read the codes and post. Even if the cel is not on get the codes read to see if you have any pending codes.