2002 trx 400ex

I got a real head scratcher. This quad starts and runs fine. If I rev it up without the airbox on it, it's fine. However, when I do that, there's what appears to be a fine mist/spray coming out of the carb. If I put the airbox on, no filter, and try to rev it out, it blubbers badly due to too much fuel, and  black smoke comes out the exhaust. Also, the choke flapper wont stay closed all the way. It closes partially. WHen I got it, it had a zip tie holding the choke open. I'm at the end of my rope. :(

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