I have a 08 dodge nitro 4.0.V6 it cranks for a long time be for it starts, it does not matter if it is hot or cold but runs fine.

SOURCE: hard to start when hot

This can be a problem with your starter so better check the starter or have it replace...

Hope that helps........

SOURCE: Hard starting hot or cold. Battery and starter are fine.

check fuel pump relay/should run pump for two sec when key is turned on. try turning key on but dont crank did pump hum/if it did look towards leaky fuel inj./faulty pressure reg. poss clogged fuel filt.

SOURCE: 2003 Dodge Ram 3500 Diesel hot and cold start issues without plug

your glow plugs not working or glow plug relay or controller not working.

SOURCE: 1996 Ford Ranger won't start

I had the same problem , and if you read your book, it could be the fuel pump shut off switch, mine was bad and went from on to off position, its usually under the passenger side of the dash, look underneath at the "top" of the carpet, and you'll see a little red switch, check to see if the thing is plugged in , if it is , check to see if the switch is all the way down. i had to get a new one , sombody must have kicked mine and made it broken, but i got a new one and it worked fine

SOURCE: TOWNCAR COLD AND HOT ENGINE PROBLEMS

mcdevito75 here, Sounds like something in the ignition system, a bad ignition module or coils, Have your repair shop take a look at these items.