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Well I wouldn't pay too much attention to the crank position sensor because it does nothing for engine control in our cars. Its actually only used to start the engine in less cranks. But help me out and post the exact DTC numbers that you are getting ( Pxxxx ). I have the factory manual and can point you in the right direction. Also, the fuel pressure regulator you can check with a vacuum gauge or check if its getting sufficient vacuum. If its not getting good vacuum it will definitely run richer.
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