well i know this has bin beaten to death but I'm asking for opinions. I talked my brother into buying a 02 lb7 to get him into diesels before he bought another p.o.s. . well he got a good deal on a non running truck yesterday and i got it running today but it has 1 bad injector on #8. motor has 100k on it and my question is do we change just one and roll the dice, or one bank, or all 8?