Oh, important thing I forgot to mention. (sorry)

when I changed the plugs, I noticed the #4 electrode had a greenish tint to it?

My buddy said thats from getting hot, he said it could be leaning out on that cylender.

That is why I suspect a bad injector.

But I can hold a screwdriver up to the #4 when its running and can hear it clicking jst like the others...