I found out a way NOT to start your Titan, unless you're fond of very scary noises coming from the engine bay:
1. Start the Titan, cold
2. Move your truck 10 feet to do some work on driveway
3. Shut down engine
The engine had run maybe 30 seconds, I never touched the gas, just had it idle and backed it up that way.
4. Leave truck sit while you do the yard work
5. A few hours later, start Titan to move back into place
VERY loud bang from engine bay, then it runs normally. When I say VERY loud, I mean like someone put a metal bucket on your head and hit it with a hammer
I figure it's gas vapors still locked in the cylinder that detonated when I started it. Shouldn't happen, though.
Will let my dealer know next time I'm there. Not that it will matter much, but just to get it registered in case a warranty case comes up in the future.