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the car is a 2003 nissan sentra spec v with the 2.5l it has threw this p0507 high idle speed code every couple of days i clear it and it comes back in a few days about a week ago it started surging at idle and when you depress the clutch brake etc it will surge between 1200-1800rpms and never idles below 1200rpms i already changed the throttle body assy thinking it was the trottle position sensor can someone give me some advice as to what it could be and where else i need to look thanks
 

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did you do any recent modifications prior to the idle problem? are there any other codes being thrown? try an idle air volume relearn. Just simply clearing the code wont fix it.

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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