my bov doesn't close when i hit the throttle. I tried to loosen and tighten the screw on top of it and it makes absolutly no difference. i checked the vaccum lines and everything multiple times. It seems to be closing at like 4k rpm but i can't say for sure since exhaust it too loud to hear the air neways. around 2 or 3 k i can hear the air vent. It flutters constantly even if i m giving throttle. Do i need to tighten the scew or lossen it even more? or is there something else i am missing.