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i would check the crankshaft sensor or the camshaft sensor the crank sensor is on the side of the engine i believe the pass .and the cam is in back of the engine .on top
When I was having problem with my 2005 Altima one of the problem was idles up and down and temp gauge surging. Check the coolant temp sensor was my problem. If coolant sensor is bad engine is trying to idle to compensate the engine temp. If you haven't try it yet than My suggestion is temp sensor.
Problems with Nissan 2005 Altima include-Crank shaft position sensor with ECU reset, ECU Factory reset from Dealer, Low Fuel pressure requiring fuel pump replacement, Replacement of ignition coils causing misfire during start-Catalytic Converter Recall-Oxygen sensor on exhaust-Leaking Valve cover gasket-Radiator failure due to plastic top & Bottom (Constantly adding water to reservoir?)
Check the throttle positioning sensor and the transmission, it sound loke the sensor is givving bad information to the computer whis is cutting the engine when in gear, this might cause the transmission to break its syncro plate if it slamms in and out of gear.
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.
you never adjust the idle speed, it is computer controlled, if there is a problem then you must clean or replace the idle speed control valve and the throttle valve (clean only), final idle speed with a clean control valve is around 575 RPM
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