09 JD X 340 27hp Kawasaki eng\ surges

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Sounds like bad valves and too much oil can damage a motor

Hi try this video it may help you find the fault it covers the codes on 4.0l engine. Ford Explorer 4 0L SOHC Rough Idle P0171 P0174 Lean Codes

Sounds to me like it is a little more then an o2 sensor problem. It could be your timing, computer or something else. I think your best bet since the computer controls mostly everything now a days you should disconnect your negative battery terminal for 15 min it will reset your computer once you replace the battery cable let the car idle for 10 more min so the computer can reset all sensors. If this doesnt work let me know also is the check engine light or oil light on in your maxima?

Think about what you just said. Only does this in times of higher temps out BUT never in winters cold. Doesn't that seem strange to you. Well I guess it does, huh. Anyway, know these systems helps. When engine is started, the temp sensor tells the computer it needs to place the engine to cold start mode. It does this and extra fuel is put into the cylinders to keep it running like a choke on the carbureted engines. But those you can turn the choke off or it does this automatically from the warmer engine. If in fact the temp sensor is not telling the computer it's warm enough to be taken out of cold start mode, it keeps dumping excessive fuel into the cylinders an flooding the engine causing it to surge and then die, because it's flooded. Therefore, the temperature sensor is faulty and needs replaced. Do that and drive on.

You are equipt with a TPS,if this get unplugged you will get a high throttle at cold start and a surge up and down at idle

where the valves set cold or hot? could make the world of a difference...is there intake leaks? bad floats perhaps....its a problem that will take some time cancelling out problem by problem

Check fuel pressure & TPS. (Throttle Position Sensor)

Problem might be the air control valve, it's located at the right side rear of intake manifold and has a hose going to the air intake duct from the air cleaner, as a test you might try pinching off that hose when the idle is a problem.