Read in haynes book could be weak fuel pump,took pump cover off of floorboard but pump won't pull out off the tank.one guy said it could be the egr valve but i can't find it on engine.has 212000 miles an i had it since 75000 an changed fuel filters but no pump.
The fuel pump would not cause a high idle. That is probably a faulty idle air control valve or vac leak. And your friend might be right on the EGR idea.
If you look at any of the auto parts stores online you can get a photo of the valve to help you find it.
The computer uses the idle air control valve to control idle speed by how much air enters the intake.
Is the check engine light on ?
SOURCE: 91 nissan Sentra losses power at highway speeds
remove the front 02sensor and drive the car like that, remove means complety take it apart from exaust, if problem goes away or gets so much better then your catalitic converter at the exaust is restricted and need a new one
SOURCE: 2000 Nissan Sentra rough idle
a rough idle/high idle is indicative of a malfunctioning TPS(throttle position sensor) this is located on the throttle body ,is attached with (2) screws/bolts to the throttle body housing right off the butterfly shaft. it has either 2 wire or 4 wire plug. the replacement part can be purchased at locale auto parts store. I would also agree that a full service and tuneup be done. this will help with performance and will increase the fuel efficiency. please rate this...thanks
SOURCE: 1997 Nissan Hardbody has rough idle/surges/stalls
the 2001 altima is what i have and I had the same problem as you. turned out to be a bad head gasket factory used cheap ones for a few years before they found the problem. one way to test this is to get a can of carborator cleaner and spray it around the area where the head meets the block under the intake problem should be around the 4th cylinder or close to driver side. if the head gasket is bad the rough idle will smooth out while you are spraying the head.
SOURCE: code p0400 keeps coming up after changing the egr valve and sol.
It may be that the passage to the exhaust is blocked also.
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