Hi josephaugust,
Thank you for the donation.
P0200 = Injector Control circuit.
Thsi proble could possibly be the injectors, its wiring circuit or PCM.
Sooty plugs indicates excessive fuel and incomplete combustion while the clean plug could be firing correctly or lean or not firing at all.
Swap the injectors and after running for some distance, recheck and if problem is still from the same cylinder, the PCM would be the likely suspect.
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Monday, March 30th, 2009 AT 2:22 PM