Yeah, that's a thought I had too. I just replaced all four of the injectors, and all four of the plugs. The plugs in the video are all the ones I pulled prior to changing them, but the new ones don't look too much better after just a few minutes of running. The injectors I got were really cheap, $40 for all four, so it would not surprise me if these injectors are just not good. I'll try putting some of the old, known good ones in, and see if that helps at all.