IMO you have a couple of options in checking the injectors and it would run in two stages.
The 1st, is you can use a stethoscope, an auto one if you have it or you can make a crude one with some hose and a solid object plugged on the end. Listen to each injector at idle and see if you can tell a difference in the rate in which they are opening and closing (duty cycle). Then listen to each while revving engine to where you feel the miss and see if there rate remains consistent while increasing with engine speed.
If you find one that is obviously different after running through sequence a couple of times, then good chance you have your culprit (though could also be wiring to that injector)
2nd stage would be to remove the injectors and take them to a injector shop and have them flow tested, if there is one that has an issue should show up, when I have mine tested they tested for the following : flow rate, variance between injectors, a static test, 3msec test and 6msec test
I would not assume they are causing your missing issue though, but IMO worth checking them if they have not been tested before or it has been a long time...
---------- Post added at 07:52 AM ---------- Previous post was at 07:50 AM ----------
LOL Metaphysico beat me to it, what I get for walking away from desk after starting a reply
... though added another good suggestion also that I missed...
