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Not sure about the rich mixture, but MAF sensor makes sense. I think this is a HFM car, if it is LH then maybe you are plugging in the wrong type of sensor (unless the connectors are different, not sure on that either)
The surging could be that the throttle motor needs to be adapted (relearned, initiallized, what ever you want to call it).
Sometimes simply turning the ignition to the run position and waiting a few minutes will let it set itself, other times/cars need to have it done with the shop computer.
Gilly
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