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Terrypenton

Joyner renegade 800 fuel/sensor problem

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My renegade 800 has been running really good until last week. Starts and runs fine when cold but after a few miles, it sputters and slows down and will only run smooth at an idle. I am running normal fuel pressure until this happens. The fuel pressure drops to 20 psi or less. I can pump the excellerator petal a few times and the fuel pressure rises to normal but drops back to 20 psi. I can watch the fuel line to the engine stiffen up when the pump cuts in then the pump shuts down. The pump is warm to the touch but not hot. Is the O2 sensor faulty and causing the ECU to go to limp home mode. This is kicking my butt

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