No when I was pulling head off I didn't really disconnect anything from the intake manifold and just moved it back a bit to pull head, well in the process It must have put pressure on the control valve (which if you look at it is actually two parts) and it separated a bit. I thought I fixed it but apparently it's VERY sensitive to being in the EXACT same position in terms of both parts of it. People be careful not to bump it when taking things off. $150 later back in business but these cams are VERY large for a "272" cam. I have to idle car at 1100 RPM and it's stlil pretty lumpy regardless of the cam settings.