Hello there hoping you guys can help me out. I have a friend who has a 2007 rx350 and she has 3 codes misfire cylinder 2, primary coil a code and a p0015. I then did a tune up and changed the coil in cylinder 1 out (which should be on the front with the cylinder being closest to passenger side. After she told me the engine light would go on and off as she would turn car off start again and it would be gone. Now she says the light stays on. I ran codes and I got a misfire in every cylinder plus a p0300 and the same primary a coil code. I used denso 3426 plugs along with a denso coil. Question is why all the misfires now? I didn't gap the plugs is that why? If it is the gap what should it be? Also how can I diagnose the primary a coil code? I really want to fix the car any help would be great thanks

edit: so I found this pic and it looks like I changed the wrong coil is this the correct cylinder identification?