I have a 03 f350 with the 6.0. It is running hard when I start it. Once it runs for a while it runs great. Then it is also lacking power when I am pulling my trailer. In some spots I need to stand on the throttle and it seems to build up enfough power to move it. What could these problems be.

Is the turbo working properly? The link below may help:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-8.html#post1415281