Did you remove the idle tube during the rebuild? If so, this may be the problem. Carter stated to never reuse an idle tube. The reason: the idle tube is inserted into a tapered passage, and as the tube is tightened, the upper end forms a seal with the tapered passage.
Not to worry.
If you did remove the tube, do so again. Take an icepick, and CAREFULLY roll the icepick in the upper end of the tube, increasing the diameter of the tube. Now when you reinsert the tube, the larger diameter will again form its own seal. CAREFUL with the icepick; idle tubes were calibrated to flow gasoline, NOT blood! :p
Don't worry about changing the idle tube calibration, as the calibration is in the lower end.
Jon.
