low vacuum

I just bought a vr4 with a few mods, and it seems to have really low vacuum. The car has 272 cams an hks vpc, hks gcc, hks evc. ect. It had a horrible idle surge when I picked it up and I reset the timing and idle and it went away. I did a boost leak test and found a crack in the smim.

I re welded that and it still has low vacuum and tries to die when I let off to idle at a stop light. My question is, could a cam be off a tooth causing the low vacuum and causing it to run funny?

 

[turbowop]

You didn't say what readings you were getting for vacuum, but they are lower with 272's. My car idles at 750rpm and pulls roughly 10in/hg at 1100ft asl.

 

My bad haha Yeah I get around 9-10 at idle and on decel around 15.

 

[turbowop]

Hmmm, on decel I still get around 22in/hg.