ok heres my thing, just recently after work in the early morning my 99 F150 5.4L will start run for a second then dies out. start again same issue. ill start it again and idle it at about 1500-2000 for a minute if that then it will idle down and run fine. with the engine warm truck will start just fine no issues. This is a new engine with maybe 10-15000 miles on it with new plugs also. just wondering what could be causing the truck to do this when it is cold. any ideas would be greatly appreciated. thanks again guys.

 

Fuel first, check the pump, do this when cold or once the truck has sat for awhile. It's common when the fuel pump is ready to die they begin to lock up or freeze when not in use ...after sitting for a bit.

 

how would i check the pump and i had a 96 chevy and it never did anything like this when the fuel pump went it just went lol. its just wierd becuase if i drive around and let it sit like for a few hours and the temp gauge goes all the way down it will start right up. it only does it first thing in the morning when its cold. i live in michigan and this morning it was like 60 outside and it didn't do it.

 

Like Jbrew says, if it's not starting always check fuel pressure first. Some pumps go out all at once, some don't. Jbrew can also give you a Michigan weather report, LOL.

 

Fuel pump is the first thing to check, then fuel pressure regulator. Once those are known to be good (or bad and replaced) then we can go from there.
It could be a number of other things, but those are easy to check (rent a fuel pressure tester from Auto Zone, hook it up and see what the pressure is, also to check the fuel pressure regulator, just unplug the vacuum hose while running and see what the pressure does (should go up 10 PSI or so)).
Could be a TPS, IAC, MAP or any other number of things.