C55 idling rough, shaking, hesitatin, stalling

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Happy Holidays!!!
I had the same problem, and in the process of changing CPS censor - hate how it's so hard to reach. While at it, I noticed the PCV hose connected from throttle body to engine had oil-like coming through, also going into the throttle body. My problem may be this oil-like thing sticking, as condition improves when the engine warms up. Do you have any insight as to what this may be and what it may mean? I'm worried if oil is being fed through, going into the TB and heading toward catastrophic situation.
Thank you.
Rick
2005 C55 with stock engine with Kleeman TCU and PSS9 shocks


