Z22SE Stalls on idle, rough idle

[Aldoske]

Hey guys, i've ran into a problem.

My astra z22se started to stall on idle, at first i thought it's a throttle body, so I cleaned it,
it didn't stopped, then i blanked my egr off, (have eml on because unplugged it). but it didn't helped also,
can you give me some advices what it can be?
Also when i cleaned my throttle body i saw a good amount of liquid inside inlet manifold, i think thats oil that came from oil breather cause i had a little too much oil in engine.
Then i checked with diagnostic and fould fault code : P0507 - Idle Control System RPM Higher Than Expected
but after cleaning it and driving it didn't came on again.
The stalling and idle rpm's jumping comes randomly, when it stalls and you start engine again, it sometimes idles perfect for hour , and sometimes you stall and next traffic light.

 

[Berto]

P0507 might come from some vacuum leak in the intake tract, somewhere downstream from the throttle body plate.

For instance if you depress the brake pedal while engine is idling and idle worsens and/or engine stalls, it's a leaking brake vacuum line/brake booster.

How to check for vacuum leaks, the texan way :

Oily residues in the intake tract upstream from the throttle plate come from the pre-throttle PCV breather hose (from cam cover to airbox => TB pipe).

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[BatmobileZ22SE]

P0507 might come from some vacuum leak in the intake tract, somewhere downstream from the throttle body plate.

For instance if you depress the brake pedal while engine is idling and idle worsens and/or engine stalls, it's a leaking brake vacuum line/brake booster.

How to check for vacuum leaks, the texan way :

Oily residues in the intake tract upstream from the throttle plate come from the pre-throttle PCV breather hose (from cam cover to airbox => TB pipe).

View attachment 67547​

What would cause a constant stream of “oily residue” via the PCV breather hose flowing into the plastic pipe which connects the air-filter to the throttle body?