Every time I start my car it shoots out a cloud of carbon out the exhaust, I have black spots all over my driveway now. It's a 98 Accord with an H22A4, Header, no cat, APEXI muffler. Any help would be greatly appreciated.

 

try running half a can of seafoam through the vaccum port on the intake manifold and the other half in either the crankcase or your gas tank. that should help with the carbon build up. If you havent done the seafoam through the manifold before, there is a video on youtube showing you how to do it.

http://www.youtube.com/watch?v=Za-b4wufsvg

hope this helps