I hate to bump an old thread, but I'm having the exact same problem. I was sure it was the maf because the ECU was throwing code 12 - Faulty Air flow meter. Replaced it with a known working MAFS, and it still does this. It runs extremely rich, and it won't rev past 3k. Any ideas what the problem could be? I'm going to check the wiring to the MAFS, but I'm beside myself with what it could be.
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