Well high hydrocarbons would mean that the engine is running rich, which is supported by your observations of a rough sputtery idle. This could be any number of things, but means that there is an amount of unburned fuel in the exhaust. Personally I would begin by adjusting the air/fuel mixture, which is free if you're willing to do the work and read through the Bosch injection troubleshooting manuals/DIYs. IIRC you'll need a digital multimeter capable of reading duty cycle.
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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.
Past: 135i, GTI, 300E, 300SD, 300SD, Stealth
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