I am getting a rough idle after my injector install. It's enough that I can feel the car shake from side to side. Has anyone else experienced this? Car is too hot under the hood to play around with right now, but i've been tossing around some ideas.

1. Injector may not be seated properly and thus fuel not entering as it should.

2. A plug may loose on one or more injectors. This was the biggest pain I had installing the whole thing. When you seat the injector all the way into the rail it makes the clip hard to plug in. Even when facing the right direction on the rail.

3. IF a plug was loose, wouldn't check engine light come on?

Also because of the idle, I am getting a knock.

Any suggestions?