I just finished a total rebuild on my V6 and am having problems getting the carb adjusted correctly. Runs a little rough so you have to crank up the idle to about 900. Had a shop put it on a scope and do their thing. The mechanic told me the throttle plates were not closing all the way, and I would have to tear the carb down and figure out why. I just rebuilt the carb and every thing looked good and adjusted OK off the engine. But they are slightly open now. Anyone run into this problem?