Sounds like your cold start valve isn't firing.. I'd think searching cold start valve/injector should net you some results. Either way, I would pull the injector next time you go to start cold, lay something down to absorb the gas it should spray and have someone crank the engine. If it doesn't spray it's most likely the sensor..try jumpering the two leads (rear driver side of the engine) and see where that gets you.
Jonathan
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