Probably ought to pull your idle tubes (like an idle jet in a motorcycle). They have tiny holes and get easily get plugged. Most likely, your tube size is smaller than .037, so good time to drill it and the DCR out.
Easy way to remove them is to use a drill bit the size of the tube, pointy end up and just lightly tap it in. The collar will stay in place. Don't worry if the tube drops out of the collar, once the collar is removed, turn the carb upside down and the tube will fall out.
To remove the collar, use a small screw. I don't like drywall screws, use a fine thread small screw and thread it in an 1/8" or so. Then use your needle nose pliers to pry up and it should pop right out. If it doesn't, warm the carb body with a butane/propane/map torch just for 5 secs or so and try again. Be sure to place a piece of sheet metal or wood under the pliers to protect the little ridges on top of the body. Those ridges are used to keep the airhorn gasket sealed and in place.
Once removed, tap the collar back on by hammering on the small tube end and driving it into the collar. THEN drill the small end .037".
