In this video, I fix and engine misfire P0306 on a 2003 Cadillac Deville with the 4.6 V8 engine. These engines are known for having bad coil packs that fail, so I got a coil pack at the junkyard. After replacing the coilpack, the misfire improved, but I was sill getting a P0300 and eventually a P0306. So we decided to pull out the fuel injectors and found out that the 4 front injectors were clogged. We replaced them with new injectors and our misfire was gone.
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Disclaimer
The information contained in this video is provided "as is", and should be used for directional purposes. Always follow safety procedures and understand the legal implications of any modifications you might make to your vehicle. Several factors beyond my control might change the information provided in this video. I do my best to provide the most accurate and complete information possible, however, I shall not take any liability for property damage and injury occurred as a result of any information contained in this video. Use it at your own risk. No information contained in this video shall create any implied or expressed warranty, or liability.