1994 Honda Magna 750 not idling?

Hello, everyone. My 1994 Honda Magna Motorcycle is not idling properly. This is a fairly new bike it only has 8 thousand miles. I did leave it in the rain a few times when the rain caught me off guard, and the only other thing I can think of is maybe dirt got into it? When its left alone running the RPMs will go from about 1.5k to 0 slowly and die. To keep it running I must keep gassing the throttle, and when the choke it pulled it kills it. Thank you!

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