YEAH I second that about the vacuum lines, I also have a 3.4L 2003, pull the PCV and shake, it should rattle EVERY back and forth motion. Mine would rattle for 3 or 4 and then nothing for the next 3 or 4 then rattle again, squirted some sensor safe carb cleaner in the bottom and dark brown fluid came out. also noticed the boot on top of the PCV was dried out and had a big crack, the seal that plugs into the top of the TB was falling apart so I replaced the whole tube, the other end I think goes to the EVAP that rubber tube looked ok, the new tube comes with everything needed. I replaced the other breather tube that goes from the back valve cover to the air intake, seal was falling off on the valve cover insertion point. If you use SEAFOAM, read the directions, I would not leave it in there for ever, just a few hundred miles - 1,000. make sure you get SEAFOAM for the trans and not gas additive. Could also be your PCS, unfortunately the PCS along with the shift solenoids can not be removed w/o dropping the trans.
Last edited by LA1; 04-29-2015 at 11:40 AM.