Hi. New here. Hoping you all can help me out! I have an 82' WellCraft 20V, with the infamous 3.7L 470 (S/N#6161927). Starts great (warm or cold), idles great at 700RPM once warmed up, butt bogs down at 2100 RPM. Carb's completely rebuilt and adjusted (including choke, rods, float, jets, etc..(...