probably not the governor - the governor only opens or closes the carb, it wouldn't make the engine stumble. Rule that out for now.
Do a quick check to be 100% sure your plug wires are connected in the proper order. Crossing a couple can result in some very weird behavior. Might as well make sure each one is sparking while you're at it.
Make sure your choke is operating properly. Take the air cleaner hose off - make sure it's opening fully.
Assuming you're using fresh gas...
If that all checks out - and it's dying upon opening the throttle, it's most likely too high of an air to gas ratio. That means you're either getting too much air, or not enough gas.
Check for leaks at the carb mount and intake manifold to head.
Make sure gas is coming from the tank to the carb in a steady stream.
Sounds like it will be - sounds more like blockage in the carb.
Pull the carb apart and go through it all one last time, cleaning every little passageway you can find - be obssesive. blast everything with compessed air. Use torch tip cleaners to push throgh little passageways. You may have missed something.
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