Well, since I put the new fuel pump on my car, it has a problem with running rich. The engine is throwing a code 12, normal, a code 34, MAP voltage, and 45, rich exhaust. I didn't think this car had a map sensor since it was carbureted. The guy at the carb shop says my fuel pump is putting out 11 PSI of pressure, but if that were the case, I should be rich all the time. It's random and usually accompanied by an SES light. Anybody have any ideas? I replaced the O2 sensor along with the fuel pump and the carb has been recently rebuilt. I'm sure the carb is in need of a tuning though.

This is a 1987 Fleetwood Brough with the 307 Olds. The carb is the stock Rochester E4MC.

The problem was related to a vacuum line that, in a roundabout way, went to the MAP sensor. I plugged it back in and the car runs great.