As far as the A/F I have never seen an IR EFI setup that was happy idling anywhere near 14.7:1 A/F. Mine wanted to be 12.8-13.2 at idle and was very happy there. It could be 14.7:1 or leaner at cruise areas, but not idle. One thing I learned a long time ago is give the engine what it wants, don't get hung up on the numbers. If it idles better at a richer A/F that what I do.
As far as the idle speed, it's obviously pulling air from somewhere. If you can richen the idle and live with the butterflies closed for now that'd be my suggestion, at least until you can re-do the shafts, etc.
Jody
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