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1989 740 Turbo, fouls one cylinder 700 1989

I have an 89 740 turbo that is running poorly. The engine is freshly rebuilt (about 10k on it now) and the turbo is brand new (well rebuilt but just purchased). The old one failed and was sucking oil under decel. The car idles poorly and seems to lack power. Cylinder #3's spark plug is black (rich) while the rest of the plugs look perfect. I was hoping someone might know of a cause for this. Any ideas?

Thanks!
dug






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