I thought of that but when I put my hand over the intake is stalls right out and would suck a baseball through a garden hose. Usually, I've found with a vacuum leak it would keep running or make a big sucking sound when the air intake is closed off. The carb does (maybe) have one issue. The long tube from the load adjustment screw that runs to the center of the carb is stuck and will not come out. It looks clear but don't most of those have small holes in the sides which may be clogged?