2000 nissan altima with scanner codes p300 , p300 and p1320

Check this link out and the causes of your P0507 code. P0507 OBD II Trouble Code Idle Control System RPM Higher Than Expected...

If you also have rough idle or inconsistent idling as well you may need the IAC valve checked. Some of the shops would let you borrow their scanner, see if you can retrieve error codes, the error codes would help you accurately identify the part that may be going bad.

check your idle is it low? that would cause the problem

THrottle position sensor check that.

Dear Tajack73: Nissan had a voluntary recall campaign on the 2002,2005,2006 Altima's with the 2.5 litre engines It envolves reprogramming the ECM.
The campaign ID # RD0712 NHTSA #: 07V-527
2005 Altima Vin's 1N4AL11**5C 100003-957025
1N4AL11**5N 400000-934180

The symptom you have described fits the one they have describe in the bulletin. Check with Nissan and see if your car falls within the campaign. Let men know how you do.

yes the alternator can send dirty ..too high...or too low a voltage to the system causing all sorts of gremlins.. test test

Most likely solution is probably idle sensor.

Take it to Auto parts store for free scaning.

I had the same problem before. after using the scanner i got a code number P0507. "Idle Air Control", New 2002 and up Nissan models like my Altima don't have an idle valve or sensor like older models to be replace. Here's the solution " Replace your "Throttle Chamber" the idle sensor is build in it, there is no other way to fix this problem. the throttle chamber is about $175.00 at your Nissan Dealer. The need your core or you will need to pay extra money. No need for expensive mechanic shop, you could do this your self. the throttle chamber is so easy to remove, four screws holds it together. I will take you about ten to twenty minutes to replace it. Please trust me and you will save big bucks!!!!!