Drive it like it's a Porsche.
If it's carbon build-up, you'll like the Techron insane recommends. After you clean it out with Techron, a good way to keep it clean is to drive it at higher RPMs. Driving at higher RPMs should only be done once the engine is completely warmed up. The high performance Porsche engines are mad to be driven harder so they build up the carbon if they are driven lightly. I run ours in the 4-5K RPM range all the way down the highway on the way in to work at least once a week when we carpool.
For support in this, I refer you to the article "Keep Her Above 4000" in the Panorama magazine, either the April or May issue.
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1987 928S4 Silver Metallic (980)/Navy (TP) 5-Speed
2000 Boxster Speed Yellow/Black 5-Speed
1966 Wife White/Brown Top
1986 Daughter White/Brown Top (Sold!)
1992 Daughter White/Blonde Top
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