I've never been in this situation. The injectors are only two years old with about 5k miles on them. Granted, they inject E85 and sit a lot. I just want to get some opinions on whether it's okay to replace a single injector or if I should just buy a whole set. My issue is that I don't really know what I'm looking at. The injectors are genuine Siemens 80 pounders, but is the high flower bad or all the others bad?