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I didn’t forensically reread the post.
Really the only thing that puts any liquid gasoline in the manifold enough that it could be “pooling” is a leaky injector; an over-rich condition or severely retarded timing leaves fuel burning on exhaust valve opening which makes the manifold glow in the dark. liquid in the manifold is certainly over rich.
This high temp fuel burn outside the cylinder destroys/melts the catalytic medium in the cat and then chunks can plug the cat and or send chunks downstream to plug the muffler. Which interestingly enough a plugged exhaust can also make the exhaust system glow or run hot.
I’d be looking at replacing all the injectors and unbolt the exhaust and verify that it is obstruction free.
Really the only thing that puts any liquid gasoline in the manifold enough that it could be “pooling” is a leaky injector; an over-rich condition or severely retarded timing leaves fuel burning on exhaust valve opening which makes the manifold glow in the dark. liquid in the manifold is certainly over rich.
This high temp fuel burn outside the cylinder destroys/melts the catalytic medium in the cat and then chunks can plug the cat and or send chunks downstream to plug the muffler. Which interestingly enough a plugged exhaust can also make the exhaust system glow or run hot.
I’d be looking at replacing all the injectors and unbolt the exhaust and verify that it is obstruction free.