Found a surprise in the intake manifold when I pulled it to check wiring searching for a P2138 code. Oil !!! Thoughts?

[Whyjustwhy]

First...my apologies. This will likely be lengthy. I have a persistent P2138 code after a mechanic did an mds delete (which I now regret) the mechanic couldn't fine the problem but I don't think he tried very hard. The code came up right after he did the delete. He said he test drove it but I'm not sure how. The code comes up within 2-30 minutes into driving and the accelerator becomes unresponsive. Today I pulled the intake manifold to inspect the wiring under and around it. I found several things and I will post pictures. There was a lot of oil inside the intake manifold. The PCV valve and tubing was covered in oil. The intake manifold runner motor was disconnected and the male connection was cracked and the wires inside it were stretched. Looking into each cylinder intake the sides are coated with burned oil. There was oil on each valve inside the head. I haven't found any compromised wiring other than the above mentioned male connection. I will be looking more tomorrow. I'm going to order a Dorman intake manifold runner motor that has the extra length connector. This was a complete bonehead location to install a wiring connector. There's no reason the connector couldn't be off to the passenger side. The throttle body and accelerator pedal have been replaced as well as the pcm and Diablo trinity tuner from Holly. I will replace the pcv valve.

I'm wondering if these things could have caused the P2138 code? Seems unlikely. It blows my mind that 2 mechanics have not been able to find the cause of the P2138 code.

What is the best way to clean out the intake ports on the head? All intakes look about the same as to buildup.