does it only do this when at idle? or through low-high speeds? if it only does it at idle try adjusting your idle a little bit at a time. if it does it throughout high-low speeds again just kinda of make minor adjustments to the needles as needed. it sounds as if your running either all needles a little bit bit off or one needle way off.(even factory settings can be way off if your engine has some wear to it becuase the compression changes and im assuming temp does also)
if all else fails take a trip to the hobby shop or call em up and see what they say.

hope i helped[:@][:@]