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carbon buildup?

4291 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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when i wash my car there is a little bit of black soot on the tailpipe. i think i may be running rich. fuel economy doesn't seem that great. what can i do to fix it. sensors, maybe?
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