What's different between starting a car cold and starting it hot. When cold, the engine needs a rich mixture to run properly. When hot it needs to be lean. If a temperature sensor doesn't report that the engine is hot, too much fuel could be sent to the engine, creating a "flood" condition during a hot start. Pushing the pedal to the floor opens the throttle plate and helps to lean out the mixture. You had to do this in the old days with carburators when you accidentally flooded the engine. I'd look for trouble with temp sensors and the vacuum hose's and vacuum operated valves associated with them. Air temp, coolent temp, stuck cold start injector, stuck or plugged EGR valve, bad vacuum check valve, air pump. The clue is that it starts good cold. Most guys run into problems with hot starts and running.

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