If you have the carbs at an angle it's difficult to get a good seal on the boots. Make sure the carbs are level with the ground as they would be in a stock setup. Line the boots up so the orifice faces are perpendicular to the ground, and use a ruler or something else flat against the orifices so you can tell without doubt they are all facing exactly the same. If you can, get the boots fairly warm so they soften up when you cinch the clamps down. I use a heat gun, but good hair dryer also works.

Runaway idle is often a symptom of a lean condition. When you snap the throttle does the idle come down then start revving up? If so try turning your idle screws in a bit. Make a note of how many turns they are out right now so you can go back if that is not the problem.

Are you using stock clamps or replacement hose clamps? If the stock clamps have worn out they may not be cinching down tight enough on the boots, particularly if the boot are hard from age. If you have several leaking at the same time it mght be hard to get all of them wet with WD40 at once to tell.

BAC750 (and a couple others) brought up a good point. If one of the sliders is off it will pull the engine off idle fairly easy. If you have to pull the carbs again check the engine side to make sure all the sliders look as if they come down the same distance from the bottom of the throats. If one is visually higher that might be the culprit.

I'd rather give someone a tool than a solution. Give them an answer and they'll always expect it. Teach them how to find the answers for themselves and they will spend a lifetime learning.
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"Not User Friendly"