Make sure you spray at EVERY connection. Everywhere you see a black tube, spray near both ends of it. Make sure you check the airbox-carb boots as well. Also, spray around the choke plunger and the throttle butterfly.
As long as this turns up nothing, I think it's time to tear down the carbs and clean the crap out of them.
...Why did you bump your idle up to 12k?? lol
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