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First time I had a coil issue, it felt like I had transmission issues, tugging feeling due to misfires.
I didn't get a check engine light, and dealership was stumped because of no codes. They had my car for two weeks trying to diagnose it.
Do you know what brand of coils they installed when you got the new ones?
I suggest getting new brand name coils and see what happens. Also make sure the caps are not warped. I just got a set of Bosch, where the caps were slightly warped and would not lock electrical connector in place. Had to reuse old caps.
Coils can be finicky. I also have a brand new set of "brand name" performance coils waiting on a replacement set, due to being faulty out of the box. I had such crazy misfires, it actually set codes.
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