One of the 8 coils had a broken harness connector - broke off at the base during packaging or shipping. Otherwise these coils look identical to the original OEM and will fix a stumbled idle. UPDATE: This issue was quickly fixed by AA Ignition. I bought a coil from AA to replace the broken one. The return was issued for a replacement was issued within a day. Impressive. These coils greatly improved the handling, response and fuel efficiency of our 6.0 Chevy 2500 Suburban, taking it from 13mpg to 15mpg on the highway. That's an increase of 13%. So far very satisfied.
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