2006 powerstroke problems

[bencar54]

Hello all,
I'm having a couple weird problem with my truck and i was wondering if anybody had any incite? Lately i have noticed that my truck is running rough until it has been driven for about 10 to 15 minutes even after it has warmed up for 25 minutes. basically, it feels like its missing and has no power until it has been driven for a while. I have replaced the egr valve (twice), had the oil changed, and checked the fuel filters and they all appear to be fine. The truck always starts right up but does have a little white smoke depending on how cold it is. Another weird problem is oil pressure. This is kind of an intermittent problem but after the truck is warm the oil pressure will drop to 0 on idle then go back to normal as soon as i hit the gas. I'm still getting the code p0401 every couple days as well. I'm starting to think i might have an injector going out or possibly a glow plug. I should note that the truck runs like a dream and has tons of power after being driving for a couple miles. The truck is an 06 powerstroke with 160,000 miles and an edge tuner as the only mod.
Any ideas would be helpful!

[korterman1]

well the p0401 points to egr "insufficient flow" check you degas bottle (radiator overflow)
the white puff of smoke is likely coolant passing through the exhaust.

[bencar54]

Originally Posted by korterman1

well the p0401 points to egr "insufficient flow" check you degas bottle (radiator overflow)
the white puff of smoke is likely coolant passing through the exhaust.

Sorry i'm kinda new at this but, what am i looking for?

[piperca]

Check this out: http://www.google.com/m/url?client=m...LK5RRAkBDuE8Gg

I think this might help.