I just fired up my new motor. It is a 408, 8.5 to 1 comp, 242/232 cam, t400 car. I'm trying to learn the hpt stuff so I'm hoping to take baby steps. My tune is from an older, bigger 408. The fuel system is the same...just differant motor. Here is a log of short drive I took and also of my tune. I noticed some kr. I seemed to be getting it at low rpm and I could feel the car kind of shudder. Is this true knock or false from maybe wanting to stall out??? I also noticed I'm always in fuel cells 21 and 22 and my stft's wouldn't read....why is this? Any help would be greatly appreciated.