2004 6.0 power problem

[Blaisetrahan]

I have a 6.0 powerstroke and completely stock besides straight pipe and every now and then it has problems starting and when it does start from 0-20 it runs fine then it lags horribly till about 70 then it runs perfect like the turbo isnt spooling up and creating boost properly.. Im getting horrible fuel mileage and I can't figure out why it's doing it..it doesn't black smoke much at all and no white smoke... Help me

[Longhorn7807]

How long does it crank before it starts? When its "lagging" is it misfiring/running rough or just not making boost? Do you have a boost gauge in your cluster? If so, what is it reading?

[Blaisetrahan]

got it fixed! the turbo to intercooler hose had a split in it and i was losing all my boost..changed it and it runs like a champ

[Longhorn7807]

Good to hear, that's a very common problem.