hey people just need to know what fuel pressure I should be at and if its time to pull the trigger on a new fuel pump. 2011 Chevy Silverado 1500 5.3 ls9. afm/dod delete texas speed stage 3 high lift cam, ls7 lifters, new pushrods, btr double beehive springs, btr trunion upgrades, circle d stall, and a wicked tune from efi performance. truck has been running good for a few months but seems to be sluggish now. had some lean codes p0174,p0175 and a annoying p0300 well we did check the maf (replaced with new gm unit), new gm intake manifolds, checked all injectors and orings, new plugs and wires, coil packs have about 175k on them I know I should prob change them. but I'm getting about 43 psi at idle and it dosnt move to 53-56 psi until about 5k rpm. any help I would appreciate and possible what brand and model to go with for my current engine setup. thanks in advance.