If it’s not fuel or fuel flow related, then likely an air leak. Try spraying carb cleaner around the intake gaskets, manifold and insulator. Likely you either have a lot of money or are buying aftermarket carburetors. The original is likely fine unless it is corroded, broke or missing a part that is not replaceable. People, unless it is one of these issues, don’t waste money on replacing carburetors! You’ve also ruined a perfectly good solenoid.