[swifty2014]

Warm weather you probably don't need any choke.
You may be flooding it with full choke.
Pull the spark plugs to see if they are fouled.
Choke will use much more gas.

 

[swifty2014]

The idle is too low to begin with. Should be closer to 1000.
And the strange sound is when the choke is on and it is getting too much gas and the spark plug are not firing well and the engine has a rougher sound.