Probably loaded up with fuel. If you have it off the ground and quick blip the throttle, can you work the RPM's up that way?
Do you have a proper glow heater you can use instead of the ez? Then you can leave it on a bit while the engine is running to help it keep running until you get it to run up in RPM's a bit.
As soon as I start it up Idols Idols pretty good the give it throttle stalls out the engine and The View back offback off of a throttle tires are still speed
Do you leave the igniter on the plug after it starts? If not, try that and once it's idling, with the igniter still on, try gently blipping he throttle to pick up engine speed.
To me, it just sounds flooded or a weak/old/bad plug or both.