I have a bad injector(s) on my 90 GXE - very high resistance. I pull
them out, and notice the 'dots' on them, right under the connector.
Four of them are blue, the others are black.  I assumed that this was
proof that someone had replaced a few. I have heard that it doesn't
matter which color you have, just don't mix them.
So, I find a low miles (75k) donor at local junkyard, and pull those.
What do you know! They are mixed colors, too!
What gives?

-mike w