I have a that I'm sure is caused by running too rich. The car idles good, but spits out carbon deposits out of the exhaust and smells like gas. Also ALL 6 of my new plugs (Bosch Platinums) were carbon fouled in less than a month of installing them. At the same time I replaced the wires with Magnecore 8.5mm wires. A few month after installing the plugs and wires, I read that supras shouldn't be running Bosch plugs. I still don't think that this caused the problem since the plugs I replaced were all fouled with carbon as well. Any help would be great.