Help, x5 running strange

[culthero]

I think I might have a faulty injector(s) after all.

Last night I cleared my codes, drove home, it started shaking and the codes came back.

This morning I start up my X, the codes are cleared, and I decide to drive to work, but instead of being idle at traffic lights, I put my X in Neutral, and revved up to about 1K RPMs. I never let it idle on its own. I was able to drive about 20 miles to work without it hesitating and without any codes coming back on.

Can I swap injectors without swapping the entire rail? If so..how hard is it?

I'm really not ready to give up yet.