The anti-diesel or fuel shut off solenoid is located on the side of the carburetor, it well have a wire or 2 leading to it. my 20/22r idles a little rough at idle, because i have it turned down to keep it from dieseling when i shut it down. I don't have a solenoid. If you have an egr valve it may be leaking by some. but as in above, even a mild cam well cause a little stumble at low rpm's. what is your idle rpm set at?
