Quote Originally Posted by BillBoost37 View Post
If the tube cracked, you likely can not see it or get it with tb cleaner in order to change idle. Pull the tube, pull back the piece that holds it to the intake and look from the inside of the tube to the outside while holding up to the light. Might not be your issue, but it sure seems like you have a vac leak.

Silly question.. brake booster hose is reconnected?
I did not end up pulling the EGR tube back off, I did however, replace every vacuum hose other than the booster (which was connected and in good shape, but anything is possible). Also, as time allowed over the weekend, I pulled the fuel rail back off, replaced the injector o-rings with the ones that came with the LIM gasket kit (really didn't think I needed to originally, as the ones on there now are about a month old), and re-seated the fuel rails with fresh grease on the o-rings. Took care of a couple of other, unrelated repairs while I was at it (water pump, VC gaskets), but everything back together, cleaning everything I took off before putting it back on, and BAM! issue resolved! I'm guessing it was the FI o- rings that were the culprit, so it seems it's a good idea to replace them every time I take the rail off, regardless of how old they are.