Seaform is good stuff. Really clears the carbon out of the motor. Smells a lot like turpentine (sp) too.
I ran a few cans through the 86 and it was like spy hunter when I went to drive it hard enough to blow it all out. People were stopping in the neighborhood thinking it was a fire.
Get it at any autostore, like advance, napa and so on. Its a red and white can. Then suck it in through a vacuum line and have fun!!