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So the dealer swapped coils between 2 cylinders? How would that improve things if they do it assuming one of them might be bad? I assume the goal to see if the issue occurs on the other cylinder so they can pinpoint a problem with the coil?
Can you take your car somewhere remote where you can really run it hard to simulate repeated track-like acceleration and get it very hot, so you can test the work they did? If not I recommend taking it to a dyno with a tech who really knows track prep, they can run it out to redline there and simulate track accelerations, Katech knows how to do this I assume others do too.
I have Willow Springs skidpad (which is really like a small oval track) only 75 min away and I sometimes take my car there to shake it down and practice car control prior to a track weekend. It's test and tune open track rules at the skidpad so very informal.
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