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A high idle meant there is excess air bypassing the idle control valve. Check for vacuum leaks. Also the throttle body may be sticking open or the throttle cable not adjusted correctly.
I think there is a recall with idle speed in that year altima. check your dealership for recalls and idle adjustment. if it has high miles try spraying throttle cleaner into the throttle body. (spray it directly in throttle body not the mass air flow sensor on the air box) when its idling. worst case you'll need a new throttle body
This P0507 code is one that's sometimes triggered on vehicles that have electronic throttle control. That is, they don't have a regular throttle cable from the accelerator pedal to the engine. They rely on sensors and electronics to control the throttle. In this case, the P0507 DTC (diagnostic trouble code) is triggered when the PCM (powertrain control module) detects an engine idle speed that is greater than the desired (pre-programmed) RPM. In the case of GM vehicles (and possibly others) if the idle speed is over 200 rpm higher than expected, this code will be set.
the throttle body air valve or throttle valve needs cleaning.it has a little carbon build up.it will cause it to idle high.get gum out throttle body cleaner. remove all electrical components.also all plastic and rubber parts the gum out cleaner will destroy it. also replace throttle body gasket.
MAKE SURE WHEN YOU PLUGGED THE SPARK PLUGS IN THAT YOU GOT THEM IN THE RIGHT FIREING ORDER,ALSO MAKE SURE THAT YOUR THROTTLE BODY IS OPERATING NORMALY WATCH IT WHILE THE CAR IS RUNNING TRY MOVING THE THROTTLE BODY ROD BY HAND
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