98 yz 400 problem

bike starts and idles fine, but if I give it gas with the choke off it will die.I used to just ride it for a few seconds with the choke on then turn it off and it would be fine. Now it doesn't seem to matter what I do. I have dissassembled the carb and cleaned it out but It did not help.Also checked for leaks in intake boot and found nothing. Any help would be appreciated.

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