i have a vacum leak under the intake manifold, Causing it to misfire on 3 of the pistons. Where do you think that might be coming from give or take?

any thoughts are much appreciated thanks.


2004 audi a6 2.7t s-line 5 speed auto, giac chip, magnaflow mufflers, 30% tint, 18" rs6 9 spoke wheels,

 

You can find an indy that has the smoke machine to detect the leak.