Tiff.. the 1000 RPM idle you experienced this morning is natural... It is programmed into the computer to help the engine warm up a little faster.
As for a high idle mod.... I have continuously been told that to do it with the 7.3, you need an AIC, or Auxilliary Idle Controller. They were usually sold for comercial vehicles that would have a pto, etc. They aren't cheap... and I really wish someone would figure out the mod to make it work without them.