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i think i need more power lol but...... its the wifes truck
No check engine light but now the tach shows it idling around 400 rpms where yesterday it was 6-700.
Clean the throttle plate, the IAC motor, and the IAC motor passages. Use carburetor cleaner to clean it all off. You will have to take the IAC motor out of the intake to do it right. It will most likely be covered in gooey black slimy carbon.If cleaning all of that doesn't fix it you may need a TPS (throttle position sensor).I recently had to replace the TPS on my wife's 2001 2500HD. Hers has a 6.0L engine as well. However her issue was a high idle. Like 900~950 RPMs.
one common problem that im seeing is the fuel pressure regulator. idk if it could cause your problems but mine will take some time to start up when cold and every once in a while i smell gas coming from the engine bay