Camm1

hey iv just bought a greddy bov type rs and i cant stop it from fluttering and when i rev it the valve doesn't open at all i have tried adjusting it from softest to hardest and it just keeps fluttering, im running it in my nissan skyline r33 its at stock boost which is around 6.5 - 7 psi does any one know why it wont stop fluttering?