Re: '05 5.3l mysterious misfire
What kinda shape are the valve springs and PR's in? To get 3 cylinders on one bank leaking, you got a heck of an anomaly, unless something clear happened.
I've seen oil buildup on some early LS's, largely in the intake manifold, but moving into the chambers as it gets sucked in. I suppose enough deposit buildup could bind behind the valve's edge and prevent a full seal.
Can you see how drastic the leak is?
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