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Probably the air regulator. It is located under the intake manifold/ throttle bosy.
Mine did the same thing a couple of years ago.
Try this to see if it is it:
Start the car with your foot slightly down on the gas pedal 1/16-1/8 throttle. Does the car start fine?
If so, the air regulator is bad. It has a little band spring in it, that opens up the air regulator to allow more air when cold. As the engine heats up the it closes it off. If it is broken, it may be closed not allowing enough air when cold.
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1991 Sentra SE - Auto to Manual swap, 15" Rota Subzero's, 205/50 Kuhmo 712's, Tsuru headlight conversion, SE-R front and rear disc brakes, SE-R front and rear swaybars, SE-R throttle body, SE-R rear inner taillights, HS CAI and Header, H&R springs, Koni shortened struts, ES Hyperflex kit, B&M Short Shifter, Autometer gauges.
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