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Did injector o rings yesterday and tourqued them down and started it and let it get nice and warm. Then torqued again. Disconected each injector while running and it stumbled every time. Put it all back together and its knocking still. Im lost. Icp is 500 psi at idle and ipr cycle is 13%. Could low fuel pressure cause a long hot start and a loud cackle when warm? Also when the truck is warmed up the rpms vary +-100 at idle. This is what the truck sounds like. https://www.youtube.com/watch?v=Oj23Bpt0_S0