If you want to troubleshoot the ignition coils, you will need to scope the current of each ignition coil on the primary (low voltage side) typically the coil ground.
When you look at all 6 waveforms, you will quickly find out which one is different and that is the bad one.
If haven't used a scope or don't have access to one, then you might want to take it in to a good shop.
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