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carbon buildup?

4287 Views 19 Replies 9 Participants Last post by  barnoun
i ran at the strip tonight and my friend said while i was making my pass i had black smoke coming out of my tailpipe when i would shift. he's pretty knowledgable about cars and said it was probably carbon buildup. is this the reason or could there be other alternatives? he also told me to put some 110 octane race fuel in and it would burn off the deposits. any help is appreciated.
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its possible it could be carbon deposits, i had some in my TB and used STP carb cleaner to clean it out. took me under and hour and throttle feels much better.
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