These are some of my experiences of resurrecting a D that sat for eight years. 1) There should be no vacuum to the distributor @ idle, and, as dmcjoe stated, this will cause a rough/poor quality idle. 2) you should be able to hear the frequency buzzing and be able to feel it buzz when you touch it. If it can't be felt or heard (and the cat runs lean, won't take the throttle) you may have a restricted return line, resulting in high return pressure and a lean condition. I found this on mine after long hours of worrying and fretting to fix it. The short rubber return line had swollen shut at the tank end. Post if you find anything. Don