OK. Checked out all the linkage and new bushings. Absolutely no binding at all bewteen either of them. When the carb is on the car and the engine is off the throttle closes just fine. With the engine running the throttle will close if you let it snap shut. If you ease off the acelerator it will hang up. It's kinda like the engine vacuum is holding the butterfly valves open. Maybe my only option is a heavier throttle return spring, but this thing has got my couriosity up now so I probably won't be able to let it go.....Any thoughts................steve