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Issues with PCV / Oil catch can / EGR (if you have one) ? Not sure if leaking intake valves could also cause this problem.
 

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That is some nasty dirt there!

What is your setup? EGR, PCV all emissions stuff still hooked up?

Never mind, I see that you have another thread talking about engine compression numbers being off. Having 2 of the 4 cylinders 10-20 psi below average might be the cause of your bad carbon build up if you have been running it like that for some time!
 

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I think I'm gonna take a look at the TB on both of our 2009s just to make sure they don't look like this. Haha
 
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