it has a distinct misfire only under very light throttle when I am not accelerating and typically 1500-2000 rpm...enough that you can feel the car bucking. Since it only happens under very light throttle, it is hard to tell if there is a substantial loss in power while it is missing.

i would think that if it were injector related then it would happen under other conditions (i.e., idle, light acceleration, etc.). the engine runs excellent otherwise.