Struggling with the 320i n43 judder under 2000rpm.

Reading the web it seems these engines have a known issue and. I known solution - though many people report dealers replacing coils.

When I test my coils they are all working a idle ( if I disconnect a coil the engine runs rough)

Is it possible they are fine a idle but failing a speed and under load?

I have the replacement coils and wonder if I should jus install them anyhow.

Car has 37000 miles on it.