I have a 1977 280Z. I've posted this prob before but I think I may have it narrowed down. After my car warms up it starts to cut out every once in a while, almost like I'm taking my foot off the gas for a second then it resumes as usual. So far I've changed my fuel filter, my fuel pressure regulator and my fuel pump. After I changed my fuel pump it stopped happening for a few days but now its starting to happen again. Tonight I'm going to test my AFM and TPS (going by what my factory service manual says). Could this just be a bad coil that starts to cut out after it heats up? What are some indicators of a bad coil?