My wife's '90 notchback has been running poorly lately. I pulled the plugs yesterday and the front two show signs of the cylinders running rich. The back two looked fine. I tried running codes and got none (no check engine light either). When I started the car, there was a great deal of carbon (black smoke) out of the tailpipe. It left quite a black spot on the drive. Where should I go from here? BTW, I put a new head and injectors on about 9 months ago and it was running like a champ.
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