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Can the idle be adjusted on 2003 ram 3500 5.9 diesel?

Yes, the idle can be adjusted on a 2003 Ram 3500 5.9 diesel. The idle speed is controlled by the Idle Air Control (IAC) valve, which is located on the throttle body. To adjust the idle speed, you will need to use a scan tool to access the Powertrain Control Module (PCM). Once you have accessed the PCM, you can adjust the idle speed by changing the value in the "Idle Air Control" parameter. The desired idle speed for a 2003 Ram 3500 5.9 diesel is 650 RPM.