Fluctuating neg. to ground on ignition coil

512Stroker said

Are you sure you are not hearing an exhaust leak.
Most miss fires get worse with load and more throttle.
Very very strange it miss fires only at idle.

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It´s not so much about hearing, rather feeling the small jerks that make the whole car vibrate significantly at idle, which is where we sadly spend most of the time in the congested Stockholm traffic.