After disassembling my carb, blowing out the air bleeds, and re-assembling, I finally got it running sort of properly. I can get it to idle down to about 1200-1300, and it sounds and smells nice and crisp. However, even after getting up to temp, it will suddenly drop off and not recover. It should actually idle about 900, and I've been sneaking the timing back closer to a proper initial, but the only way I can keep it from randomly dying is to keep the idle up past 1400. The carb is an older BG 750 DP, with no choke or air horn, and downleg boosters. I set the idle mixture screws at 1 1/2 turns out, as a baseline. It starts great. Half a shot of gas, hit the button, and it's running. Just can't get the idle sorted. ??