Hey Con, if your voltages all checked good & you see them pulsing during cranking then I think this is all good, ECU's good, & dist. module's good. They're just too fast for you to see them at idle. If you hook up a timing light & point it at the injectors & watch them at idle RPMs you should be able to see they're fine cuz it will cut the actual real time down because you'll only be able to see every 8th revolution. I think your high idle is something else, rather than injectors dumping.