I have an 07 5.9 I just finished building an engine for and installed in the truck. I got the truck with a locked up motor so I never heard it run until now. After getting it started I can’t get it to rev past 1700rpm. It starts right up and has a total of about 10 min of run time so far at 1700rpm. No visible leaks and no codes using my snap on scan tool. I’m trying to figure out the revving/low responsiveness issue so that I can break it in properly and seat the rings. Anyone have any insight suggestions or ideas?