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Hey, you need also to look at the ignition coil. they go bad at higher miles. check the spark. take a good plug and plug it on the end of one of the wires and unplug the rest off the engine. Now, hold the tip of the plug on a good engine ground. dim the lights and then crank the car and watch the spark. it should be very bright blue, it its weak, then the coil is going on you.
The o2 sensor should be the first thing to check. You can look at the codes by turning the screw on the ECU to self diagnose and watch the flashes, record how many and the pauses and check the manual for the codes. it will tell you the O2 issue if you have one. Or get a nissan consult from a nice friend.
Chris 92 classic
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