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Raw fuel out exhaust under full throttle

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Trank

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Hi friends.  I have an 07 ls w about 130k on it now.  Ever since I bought the car 5 years ago w 68k, i see a ton of dark smoke in the mirror under full throttle.   Power is great, and car has always been smooth, fast, and trouble-free (probably why I've never gotten around to fixing this).

That said, clearly something's not right.  Any ideas?  I've run several bottles of Seafoam through the tank, and even ran a bottle through the crankcase, once.  Car seemed to run even smoother, but didn't make a difference w this issue.  TIA.

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