Hey guys it is Markes12344 here, i a currently at the Fields. Therefore i can not provide my 5 obd codes, but they consist of; egr under 2v, egr not opening, fault/rich.

Anywho, here are my truck specs and details:
New 5.0 10months ago, w/ remand injectors.
New injectors A week ago.
New idle control valve and throttle Positioner sensor also a week ago.
Some vacuum lines have snapped and repaired with tight fitting rubber hose over each half of the line reconnecting them.
New spark plugs with motor (a given)
New spark plug wires 4months ago.

Now the problem; when i was replacing the injectors i had oil running down my furthest back, and next to it, port. These are the ones right above the the breather pcv line between the intake and passenger side rocker valve cover.
As i reinstalled everything after swapping injectors, i left the pcv out of the valve cover and started my engine to a idle, upon putting my finger over the hole of the pcv its was sucking air.
What would be causing this?

Also my driver side to air box is oil free.

 

If it was at the PVC valve = Normal

If it was at the valve cover = An internal intake leak comes to mind.......

 

It was at the pcv valve, But why the oil up it, and down my intake? bad thing? i would assume soo...

 

Also here are the OBD codes from a KOEO test:

173: HEGO (HO2S) sensor fault/rich

327: 1. EGR valve below minimum voltage
2. EVP/EPT circuit below minimum voltage

332: INsufficient EGR flow detected

334: EGR closed valve voltage high