Hi everyone, I'm new to the Forum so hopefully this post is okay! My sbc started making this shuddering/pulsating noise once the throttle is released during a free rev. I've spent the last few hours trying to pinpoint the problem with no luck. Does anyone have any idea what could be causing this? the oil pan is slightly touching the steering rack, I will be spacing it up slightly, however this has never caused a problem before. It is still open headers, so could it just be sound reverberation and i'm overthinking it? youtube video will be posted as well showing the sound.