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Here is a little bit of gold for everyone having coil pack issues. I hate to see all the suffering and money wasted replacing coil pack, especially people thinking they need high dollar ones.
I had been throwing miss fire codes on both banks intermittently for many track days. I would just clear the code and continue. It got progressively worse so I decided to investigate.
The problem is the electrical plug at the coil pack. It is poorly designed and the electrical connection is not great.
I decided to do an experiment and tweeked the male pins on the coil pack with needle nose pliers. I just twisted them 10 degrees or so to preload the connection and put them back on the car. Its been about a year (5 or 6 track day weekends) and I have not had another issue. I hope this works as well for you guys as it did for me.
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