Depending on how the enrichment valve sticks if in the open position it should start and run when engine is cold but will produce a smokey exhaust as it warms up due to the too rich mixture. If it is in a closed position it will not want to run at idle but as it warms up it will run fine. Since it idles fine until you throttle it and then dies indicates to me a bad carb either by slide not rising as throttle is opened or too much fuel as throttle opens flooding it out.
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