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It really takes specialized equipment to test them completely. They need to be load or stress tested. You can do basic testing with a digital multimeter. There are values for resistance between leads but it could pass this portion but not the load test. Coils are rated at 100,000 miles. When you start having problems with misses etc, the coil should be replaced.
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∙ 13y ago
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does the coil pack make it run better
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