The ECM has been replaced in this car.
I was curious as to how injectors commonly fail, i.e. since this
steady miss only occurs at idle and disappears as soon as throttle is
applied. It's as though the injector is slow to open and won't open at
all until pulsewidth is sufficient to give it time to get open.
IOW, when they fail, do they begin to function more "slowly" and then
finally not at all--or do they just quit?