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The oxygen sensor is the little cylindrical sensor that sticks out of the exhaust manifold. It only has one wire (GA16i) coming off of it, if memory serves me correctly it is a green wire if it is a Nissan part. These sensors can be had from an autoparts store for around $20 for the old one wire style. It is easily removed with pair of vice grips. Do not try and be cheap and just clean the sensor as this will definitely ruin it. If it only seems to happen in humid weather, you may want to try a new cap and rotor as well. These types of items are covered in a general tuneup. Fuel filter, air filter, timing check... All of these things can contribute to faulty running habits. Also, the car has some age on it. It would be a good idea to check all of your vacuum lines for cracks and leaks. Hope this helps!
John
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B12 w/ JDM SR20DE 424 whp 328 ft. lbs. 2440 lbs w/ a full tank.
B14 w/ VE 244 whp 228 ft. lbs
"You might be a king or a little street sweeper, but sooner or later, you dance with the Reaper."
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