You might not know but when does the engine misfire, hot/cold or all the time? Has this set a check engine light-codes? I find it very hard to believe that all 8 injectors test bad. Generally they last around 200k or more without problems. With the exception of the electronics, there is basically 2 sides to these injectors, fuel side and oil side, did they give any details on the reason all 8 failed? Was the ICP/HPOP pressure tested, fuel pressure tested, injector buzz and cylinder contribution tests performed? Was IPR % and ICP compared for possible problems or pressure leaks/issues?
Its fairly easy to cut injector o-rings on these and new ones should always be used if removing/installing. If an upper o-ring was leaking you could see oil bubble up around the injector where it goes into the head (valve covers off, cranking or running) If lower o-rings were leaking it would push engine oil into the fuel system, easiest way to see this is getting a fuel sample or pull fuel filter cap and look for oil in the filter housing.
Also what about the copper washers on the ends of the injectors, they should be replaced if removing/installing injectors. Hopefully someone didn't leave one out, or a piece of o-ring, or maybe double stacked the washers.
Sorry for the long post, you can literally write a book on this subject, of course it sounds like most of this information is only relevant to the person doing the work.
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