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What do you mean the engine can "rev all the way up for short periods of time" ? Do you mean it revs to 2500 for short periods of time or past that? You say it's running rich, how rich? Is your Fuel pressure regulator working properly?
CAS timing could be off, check that. Also make sure all wires going to the MAF and CAS are in good shape. Have you checked your o2 sensor is operating properly? What ECU are you running? Where is you air filter located in regards to the MAF? Lots of things to check here man
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