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First I would do a compression check on all the cylinders...second step would be is to check the fuel pressure when its cold and see if there is enough pressure....if you notice the cylinders compression is low when its cold and will not start there is your problem......alot of times an engine will fire up off of ether and run because of the quick burn rate of ether and once its moving that fast it will run not great but so so....until it warms up and everything expands,,,,on a second thought your fuel pump may be weak or you have a plugged up filter allowing just enough gas for it to run leanly...let me know what you find.
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