Stock end carbs are WAY lean. Should idle about 1000 rpm at 10 BDTC. I ended up with all 3 carbs with the mixture screws out 1 5/8 turn. You definitely have to have some patience tuning them. Need to put your finger tip over each end carb outer air bleed one at a time. If it speeds up it's lean, slows down it's rich. Definitely check that that funky fast idle tab you twist with a screwdriver is not hanging up the fast idle cam from dropping all the way down, and that the end carb linkages are properly adjusted. I chased that fast idle cam issue for a while. Hesitation could be a mis-adjusted accelerator pump, or the end carbs could be opening a little too soon. The end carb springs are really light. Need a selection of vac sec disphragm springs to tune it.