460 IH propane will not run now

I have a 460 IH propane was running like a top perfect never missed a beat. It has a new carb and propane regulater . IT is full of propane just filled it up. Have ran it several hours about 50 since new carb and regulater. Now it will only run when you try to start it when the starter is spinning it it will run as soon as i let off of the starter button it dies. What could be wrong????
 

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