Well i have my 1993 w350 in total restoration process and i pulled the injectors in the process when i was doing a new front cover and vacum gasket kit. Now i put the injectors back in and the truck wont start like it use to. It turns over forever and i pump the pedal and eventualy it comes back to life. Now once i run it for a bit it start right up. Then i let it sit for a while and it does it again. What should i start checking!?