there is no idle screw...the idle can only be adjusted via OBD2 CONSULT2. stock idle ranges from about 625-750 and for your application, you do not need the idle itself adjusted. you can do the idle relearn and this generally cures many ailments although you may need a trip to the dealer. chevron is as good as gas gets and if you are not having cold start problems, it is less likely to be the fuel pump as the cold start problem is the main symptom. if nothing else, it could be a crack problem that does not often happen but like all cars every occasional vehicle has one. you can check nissan's website for TSBs which are technical service bullitens. they will list common problems that happens to the car and the symptoms if they occure. if you have one of these problems, you will have no problem getting the dealer to replace it with no out of pocket expense.
I would first try this...it is the idle relearn.
-Warm up engine.
-Turn ignition switch “OFF” and wait at least 10 seconds.
-Confirm that accelerator pedal is fully released, turn ignition switch “ON” and wait 3 seconds.
-Repeat the following procedure quickly five times within 5 seconds.
a. Fully depress the accelerator pedal.
b. Fully release the accelerator pedal.
-Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 20 seconds until the MIL stops
blinking and turned ON.
-Fully release the accelerator pedal within 3 seconds after the MIL goes ON.
-Start engine and let it idle.
-Wait 20 seconds.
nothing to say