O2 sensor trouble code needs fix

"O2 sensor high voltage" is the prob. I have changed out the O2 sensors before and the same problem occurs where the engine wants to cut out, unless thrown in neutral to keep the RPM's high. It has a new rad, water pump, thermostat, yellow top battery. Any ideas or do I need to look further into the fuel system like the fuel filter, injectors? Any help is appreciated. Thanks.

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