The 97-03 firmware only supports raising the Idle speed, not lowering it. Unfortunately, the 97-03 firmware is a bit more complicated because of the communications structure between the programmer unit and the "smart" cable. It makes it difficult to make certain changes in the firmware which is why the 97-03 doesn't have all the fancy stuff that the 04-08 does. It's one of those things that we do want to get updated, but because of the time and complexity involved, I need a week of peace and quiet to effect those changes. Until then, it's all we've got.
Hope that makes sense.
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