2010 XB... I can't seem to find this misfire problem out for nothing(throwing code for 4th cylinder PO304)? I've tried everything I know from S-plugs,coil packs, wiring harness burns, injectors, O2 and MAF sensors and nothing has worked(sure I 4got a few things 2 check) besides I haven't checked solenoid last thing on my list, after that I'm seriously dumbfounded bout it lol. Any ideals would be much appreciated, thanks? It's a 2010 scion xb 2.4L misfire.