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Another common problem, especially if the carb ran good and the trouble suddenly occurred on it's own with no other changes is fuel contamination. Was your entire fuel system new/fresh from the tank forward when you installed the carb? If not some junk likely made it's way into your fresh carb, sometimes it doesn't take much to cause the issues you described.

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Trash in the carb. I was having same symptoms at one point and the carb was full of crap. Fresh clean carb and all was well