k20em2

The vacuum reading on my boost guage is 5hg. I checked for any loose hoses and tightens all the clamps. What methods are there for finding vacuum leaks? Can heat affect vacuum? I have my vacuum manifold near my turbo manifold (its about 1ft above it). I'm about to replace my pcv hose since there's a small kink in it, maybe that it. Anyhelp would be appreciated.