I have a 04 lb7 newer engine has maybe 40k on it. When new engine was installed I had head studs, bd super max turbo, and 15% over brand new injectors. For now I'm running a garbage edge juice with attitude. I'm going to be installing a lift pump. Truck is hazing at idle and think it's the injectors. Have to run a balance test still. But my question is do I send them out for rebuild? Replace with new? Also is 15% over good or do I need to go bigger? I plan on having efi tuning done too.