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My idle on my 2001 Bonnie (after warm-up) is rock solid at approx. 750rpm. I think you sort of answered your own question. Somewhere you have a vacuum leak. At 1400rpm the effect is less, try idling it down to 800 or 900 and see if it really becomes unstable. If it does, more than likely it is a leak. Check for cracks in the rubbers connecting your carbs to the intake.
Check your idle mixture adjustment. If it is to lean, it will be difficult to idle steady. If you have stock 40 pilots, usually the screws are set to approx. 2 1/2 turns out.
I usually put a small dab of auto tranny fliud, with a toothpick, inside the nipples just to make sure they are all airtight. Makes them slide on easier to.
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