Just a suggestion here but were the injection pump mounting nuts good and tight?Seen some 6.5 engines and heard of one 5.7 diesel with a loose injection pump and the pump timing was all over the place because of being loose.Were those 8G plugs USA made?They could be made almost anywhere nowadays.
1996 GMC Sierra ext.cab Z71....with new genuine GM 6.2 660 short block,4L80E/6.5TD cylinder heads,DS4 5521S,82' 6.2 rocker arms,acdelco TP1069/Racor 20S fuel filters,4" diamond eye exhaust,3.73 G80 locker,stanadyne 37818 injectors
1996 Chevy K1500 Z71.....with '99 6.5 506 goodwrench van engine,88-93 6.2 diesel Napa y-pipe,'87 700R4,acdelco TP630F/Racor 20S fuel filters,Bosch non-turbo injectors,stanadyne blue tag 5088
1993 Chevy K1500 Z71...with 97' 6.5 TD 506 block,82' 6.2 rocker arms,stanadyne 37818 injectors,stanadyne blue tag 4911,DSG girdle,reman 700R4,Banks boost/pyrometer gauges,acdelco TP1069/TP943 fuel filter system,4” diamond eye exhaust/2 piece crossover
2008 Mercedes Benz E320 3.0 V6 turbo diesel
2013 Volkswagen Passat 2.0 TDI