When I look up vacuum diagrams the same generic ones pop up. Even the GM manual I have has some stuff but the pictures are so small they are hard to follow. The one on the fan shroud is hard to see and doesn't seem to cover enough. Then there is California editions!! $#!?&. I want to get rid Of the smog system, does anyone have a clear to read "stick" drawing for this I can't possibly be the first. Please help!!!!