Take the carb off,and put it on the bench.
Take the top off,and check the float height. They are notorius for improper float height.
With a compressor,blow out all air/fuel passages.
Dirt particles can kill any carb.
Screw top back on.
Bring back to stock settings with Orange spring/Metering rod.
Turn a/f screws out 1 1/2 turns.This is just to start,and will need to be fine tuned.
No vacuum advance at this point. Plug both sides.
(I dont run it at all,its a Muscle car for gods sakes)!!!.
My choke is manual and wired open. Either way make sure your choke is opening all the way,and out of the question.
Bog off idle can be your pump shot.Move to the hole closer to the carb body for more of a pump shot.
Springs are for power mode,not idle. Lighter spring will open up the metering rod sooner,giving you more fuel quicker.It could be falling on its face because it needs more fuel quicker.Start at orange,and go lighter if the problem persists. Heavy springs are for heavy cars,opening the power mode slower.
Measuring your manifold vacuum will let you know what spring you need,but like I said start with the orange. Ede are calibrated very close out the box.
Not sure if you have the manual for your carb,but if you dont your tunning in the dark. You can look it up on line.Get your self the calibration kit. Once you know the principles,there cake.
Or you can get a Holley and tinker with it more than a British motorcycle.:-D
