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I have a 2002 Nissan Sentra SE-R with an auto trans. and the QR25DE I-4. It idles really rough in drive, but in park and neutral it is as smooth as could be. I'm baffled, to say the least. I recently replaced the spark plugs, I got NGK Iridiums and I gapped them at .0444. I will be getting the pre-cat removed within a week. Any help would be greatly appreciated. Thanks in advance!
 

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IDLE

DID YOU GET THE ROUGH IDLE BEFORE OR AFTER THE PLUGS?
I WORK AT NISSAN PARTS AND I SEE ALOT OF THIS, ALSO IT CAN BE YOUR THROTTLE BODY OR OTHER THINGS. I SUGGEST GET IT CHECKED OUT AND IF YOU NEED ANYPARTS I CAN HOOK YOU UP. IM IN CERRITOS CA
 

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you could also try the idle air volume relearn

Do this:

Drive around and let the engine warm up to normal operating temperature (go for like a 10 min drive around the neighbour hood or something)

Go home, stop.

In neutral, e brake up, no touching the gas, clutch, or brake pedals, steering straight

put key in ignition
turn key to on position wait at least 2 seconds
turn key to off position wait at least 10 seconds
turn key to on position wait at least 2 seconds
turn key to off position wait at least 10 seconds

take key out of ignition (not sure if this does anything but I do it just incase)

put key back into ignition
turn key to on position, then turn it back to the off position, you should hear valves adjusting. Wait at least ten seconds.

Take key out of ignition

Now grab a stop watch.

Put key into ignition turn it onto the on position, at the same time start the stop watch.
When stop watch says 3 seconds do this:
fully depress and fully release the gas pedal FIVE times.
When stop watch says 15 seconds fully depress the gas pedal
around the 25 second mark the SES light will start to flash
around the 35 second mark the SES light will STOP flashing, when it does this IMMEDIATELY take your foot off the gas.
Start the car
Wait a good min or so (idle will correct it self)

Turn it back off. Wait a bit, turn it back on, and idle should be fixed
 
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