I stuffed my head under the hood while my son was tapping the gas off idle and I could hear a pfft pfft pfft, each time he hit it. I found the TMIC to TB hose was a little loose at the TB end. That must be what the knock sensor is hearing. Each time throttle is added, a little boost leak. I didn't leak test with enough pressure to find it. I tightened it up as best I could and I got rid of 80-90% of the knock. I think it's a little crooked so I can't get it all the way on. So I'll have to pull it off and clock it, but it's definitely much better. And I haven't seen an over boost either since I tightened it either. Seems weird that boost leak could cause over boost. If it could.