Your best bet is to take them all to a shop that can flow test them and go from there. At the shop I work at we flow test them and check the spray pattern on our flow bench, then imerse them if the cleaner and they are cleaned with ultrasound, back to the flow bench and retest - sometimes 2 times through the cleaner is needed - if they don't perform properly after 2 cleaning cycles they go in trash. When all this goes well you will have a nicely matched set of injectors with new internal filters installed, sometimes even new injectors don't have equal flow and be cautious about "refurbished" do you really know what quality control was used, possibly even just an external clean up is all that was done. Should be an injection shop in your area or check the high line independent repair shops, that is what we do - Jaguar, Porsche, Land Rover, Aston Martin and such, and of course MY JEEPS. Hope this helps, and yes the pulse duration signal is determined by the ECM.
Mike
