The easiest thing to start with is to block the air entry of the end carburetors. Have someone else keep the engine running, and then cover each of the end carbs so no air can enter. If this changes the idle characteristics significantly then your butterflies are not seated as well as they need to be. If this has no effect, the proceed with the recommendatoins above. I used to have that problem on one of my cars and it turned out that the rear float had problems. I had to assure it had no restrictions, and I set it a little lower than spec. However, I did see external signs of fuel on that carb.
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