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2001 Nissan Altima Questions

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Thinking it may be loose wires or anti theft system needs to be reset.. The code for the antitheft lock came up when i tested the car
Radiator and radiator pump is new but my vehicle keeps revving on its own and it over heating any help on what can be the cause??
It will run very quietly and then all of a sudden lose power
The car engine is so quiet and runs really well...except for this issue that is happening now...today i was sitting in the vehicle trying to let it run...it did for like 7min and then just off as if a kill switch had been hit
I need to replace the refueling control valve on my 2001 altima as the signal port from the filler neck vapor line is broken.
The car runs fine with no codes, but am not sure if this can cause problems.
This is a 3 port round plastic valve that sits under the car on top of the gas tank in a cavity in the rear of tank.
I need to know how to get to it to replace it, is there an easier way or do I need to drop the tank to replace.
Park my car shut it off break Light won't go off.
once a while it occurs
RPM's drop when at full stop and sometimes stalls, hesitates when giving gas.
Check Eng. Lt. Occasionally
There is smoke coming from under my hood and a funny smell
Today after i got my oil changed and pertol refilled, my Service Engine Soon light stays ON. I got the code from an auto shop as "P0400-Exhaust gas air flow". How to fix this? I checked the petrol tank cap also. It is closed properly.
cut out once at an intersection was rough starting then just fine - trip meters reset - only time this has happened so far
i start it back but it hesitate to crank and then when I start driving it will shut off again
Car loses power and skips while driving, dropping to 10-15 mph before regaining power. The problem is always worse in the morning when the car is cold. The check engine light has not come on.
i change the relays
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