I have a 2009 G 37 sedan that keeps throwing a random misfire code I have replaced both bank 1/2 MAF SENSORS , i’ve checked the coils replaced the spark plugs, Flow tested the injectors and checked for vacuum leaks with nothing changing? what could it be i’m lost in this car at this point and i can’t seem to monitor the live data for individual cylinders with none of my scanners ? any suggestions?