I wouldn't describe it as a knock, but it is something like that. It isn't noticeable under power. I did take apart my POD's and cleaned them, but maybe the pop is off on one of them and it is hitting too early? The only other thing it could be a lobe going bad, but it's not running like that.
I guess I could have my injectors flowed and popped, but am worried about the cost.
Thoughts?