Easiest thing is to have it run buzz test and scanned incase just bad UVC harness or connection loose. Now if v covers are off you can watch the oil spouts and see if all spit oil out the same rate. You could also ad idle remove injector wire 1 at a time and the one that does not get worse is the one that is the miss. I would think it is just UVC harness or clip loose.
Could also have loose poppet screw and it would miss bad and spit little or no oil