Just bought and 03 lb7, trucks great other than it cranks for 5-10 seconds before fires, I just put new filter housing, filter, and hoses going from filter head to cp3! Truck is still doing it! I got all my injectors checked out and all 8 are perfectly balanced! I have all the right pressure I need when running! Any ideas?

 

it could be spinning a little slow old battiers or something that makes it takes longer to build enough psi to fire the computer wont let injectors fire till min of 1,450 PSI could be a weak cp3 if its high miles just a few ideas