I have an '85 fj60, rebuilt and desmogged, ran great for a while after rerouting some vacuum lines and recurving dizzy. Now, it starts, and idles, but if I drive it, in dies when getting into 3rd gear, going for fourth. It idles with very little fuel in filter, and sight glass maintains. If I rev it, sight glass loses fuel. When it shuts off, fuel filter fills all the way back up and sight glass comes back to normal. Truck was desmogged before I bought it, I rebuilt engine (#6 cylinder ate the rings) and head but don't know if carb was rebuilt for desmog or not by PO. Probably not, because dizzy needed recurve. It has a new filter and pump, and no clogs to carb from tank. I bought some bigger jets, thinking I could do a carb rebuild for the desmog, but have not installed because I think they would drain float bowl faster. I've had the air horn off, checked float and everthing, all appears normal and clean. Any help would be greatly appreciated. CHEERS!