KLAX--I had multiple problems(so my symptoms were overlapping) but the lower hose was leaking bad, see picture below. I also had a loud popping sound, misfires/rough idle..on and on.
You can just get a look at the lower hose if you flash light back up in there with intake removed.
This picture shows that the original hose fitting was a 90 degree which it bent about 2 inches from the fitting. The newer hose fitting is 45 degree angle eliminating the stress where hole is in picture.
Last edited by love2drive330CI; 11-13-2012 at 09:31 PM.
Reason: hose angle