Hi guys. I just got my new-to-me D-50 a few days ago and I'm having some issues getting it to run smoothly. The idle is rough and high, the truck stumbles at low throttle openings, and generally runs really rich. I know my way around motorcycle carbs, but this is my first carbureted car/truck. As a preliminary check I looked over all the vacuum lines I could see, and all looks good. Any ideas?