I am very surpised that voltage holds on the battery lead after you disconnect it, this is not coming from the coils (an inductive item) but from a capacitive item. There are some capacitive items in the car, but I'm still surprised the voltage stays long enough to even measure it. But anyway, no, this is not an indication in and of itself that the coils or ECU are a problem. The cycling of the Throttle Body on a 'no start' is not abnormal. However, if you simply turn the key on, the throttle body should cycle right away, then be silent for a time, then cycle again. If it is constantly making noises, that is a problem.

I speak from experience here , we had a car in GA once that ran very rough and would not always accelerate. If you get the car sit without the engine running and key on, it would almost constantly make odd noises. Replacement of the Throttle Body fixed that car.