Hey y'all I have an 07 Colorado (automatic I4, Z85 i believe) and out of nowhere it developed a miss after about ten minutes of driving it. We brought it to the "talented" gents at O'Reilly and sure enough, cylinder 4 misfire. So we unplugged the battery overnight and it was gone for a few days but then came back. so next we pulled it apart and I replaced the coil pack. Now it starts missing as soon as it starts (rather than waiting ten or so minutes like before). So I pull it back apart and check the spark plug but it looks just fine. So just to be sure I swap the coil pack off cylinder 1 and still the same. I just went and bought a new injector but I have yet to find any threads about replacing them. I'm just trying to find some advice or see if anyone else has had this issue. I miss driving my yellow lady! Thanks in advance!