It sounds like the slide isn't seated right. Might be 180 degrees out. Pull it out spin it, and re-seat it. The air mixture screw should be 1-2 turns out. 1 1/2 turns is best to start with.
My bet is it's something to do with your throttle cable or slide not seated right. I actually had to remove 1/4 inch of shielding off of my cable to get the throttle right. Without that it wasn't slack enough to let the throttle relax.
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