maybe ficm??
 

i just bought the 03 6.0 and before i bought it it started perfect no problems what so ever, but now that im driving it everywhere once and awhile it cranks just a little bit longer than other times, maybe 1 or 2 seconds, is this normal or whats going on?

When it takes longer to start, is the motor up to temp? Or is it cold when it takes a few seconds longer to start? 1 or 2 seconds might not be an issue at all, hard to tell.

just pending, sometimes it can sit over night and do it and sometimes it sits 20 minutes and do it, i just didnt know if this was a normal 6.0 thing or not, i have an updated ecm and tcm i think it was, its tagged under the hood its go the date the dealer number and another number, i dont know if that means anything tho.

I doubt it's the FICM, but that's quick/easy to check. Probably worth it just to gain the knowledge on it. Just google search 6.0 powerstroke FICM test and you'll get a ton of links on how to fix it. In fact I just posted this last week probably 3x, just look some of the older threads or search on here. It will be an easy elimination for you.

maybe ficm??
 

Check the injection control pressure sensor (ICP sensor). It's back by the firewall on the drivers side on the 03's. If there's oil in the plug the sensor is junk and needs replaced. That sensor will cause it to crank longer if it's bad.

Here's a decent article explaining the ICP sensor too. It could be the ICP, but I'm leaning towards it being nothing and it's your first 6.0? Or possibly developing a small high pressure oil leak.

DTS Articles - ICP Sensor Failures
DTS Articles - 6.0L ICP System Leaks

Also, who's tunes are you using?

Having an early 04 myself I am pretty sure it is the ICP, they are in a bad spot on the early motors, they see too much pressure to handle and leak through the sensor itself and the oil impregnates the wires also, the new one comes with new leads as well, replaced mine and within a year it was doing the same thing you are talking about, been doing it for 2 years now so I just live with it, smokes pretty good on restarts every now and then, Oh well//
it can be replaced from up top, remove the degas bottle, remove the FICM on the drivers side valve cover and you will be able to see the sensor on the cast iron HPOP cover, its the one toward the the back, the one toward the front side of that cover is the IPR

yes this is my first 6.0 i just traded my 7.3 in on her last monday, i was leaning to it being nothing but it never hurts to ask and learn just for future knowledge, and nobody's yet the truck is all stock except head studs and egr delete

Oh ok, missed the part in your sig about soon to come I guess haha.