So after finishing my fuel return install I now have a misfire in cylinder 4 and eventually a misfire in cylinder 3. This morning I made sure the injector clips were seated properly and the coil packs as well, then I pulled the plugs for cylinder 3 and 4 and they looked rather black, more so than what I'm familiar with seeing, I swapped them and the problem stayed in cylinder 4, but then after idling maybe 20 seconds also appeared in cylinder 3 and my vsa light turned on :think:

Here are some pics of the plugs, best I could get my camera to focus up close:




Could this be because I haven't installed a vacuum line to the FPR yet?