I have a 75 Fj40 that ran great with a Holley 2 barrel, but I wanted the oem look and realiabilty offroad so I bought a 78 Aisan to rebuild. The PO had completely desmogged the truck, but I do have 12v running to the idle solenoid. The carb was dipped using Berrymans Chem Dip, the passages were then cleaned again with carb cleaner and then blown through with compressed air. I reused the jets, springs, etc. New gaskets, check balls, and seals were used. Fuel level is perfect on the sight window. Full return is capped at the carb. The truck will start easily but only runs at a very high idle (2,000 rpm). I have been unable to get the idle down by adjusting the high speed, partial speed, or low speed adjustments. I looked inside the carb while it was running and the secondary Venturi was spraying fuel but not the primary Venturi. The primary sprays fine from a small nozzle in the corner of the primary with the engine shut off. The secondary and the primary butterflies are both fully shut. I have never encountered this before and didn't see any discussion on the forums from anyone else having this issue. Any help would be appreciated.