First, CONGRATS on using eehack! The learning curve is steep but you're about to become a master LT1 mechanic.
..... Your injectors either need to be cleaned or they're just junk. Stock LT1 injectors are not ethanol resistant and should be thrown in the garbage. You can certainly run fuel system cleaner through it. Walmart sells a big bottle of it cheaper than I've seen anywhere else, though I don't know how good it is relative to something like Chevron Techron.
Code 44: ...... If you are still running stock exhaust manifolds (and that's not a bad thing), strongly consider removing them as soon as possible and having them planed flat at a machine shop. This will eliminate broken bolt problems for good.
Just to add that in a past life I considered injector cleaners as no more than snake oil. But, wife's SUV took to such instant cure with periodic CEL that I'm won over. Search showed Techron as most effective, and it boils down to the same ROI v. more quantity with 'The big cheap bottle' of SuperTech.
The out-of-plane manifolds caught my eye. First ever hearing this. I always figured the broke bolts are from factory over-tightening or bound-up spacers.
\'96SS SOB: SSRI, Herter Tune, Tri-Y II, , 3000 Edge, F/HO bars, METCO extendeds with CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear)
\'96FWB BUW-Butt Ugly White: PCMPerformance tune, HDFA w/ swissed filter, 1/2 SLP s.s. catback with H- and Flow Super 50s, oem opti rebuilt 3 times, SS Bars, METCO LCA, Airlift 1000, Monroe SS, PowerTrax No-Slip, CTS wheels with +1 rubber. Finally, wait for it... LT-4 knock module!