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if its too high or too low your looking at 2 things fuel pressure regulator or fuel pump. depending on where you test it at. you said you put in a high performance pump right? theres three wires on a maf sensor 12v ground and signal. your car can run with or without the maf plugged in if you stay on the throttle, it should stall out unpluged on a working engine. your fuel pump might be pushing to much pressure making your injectors leak and flooding out. how does the exhaust smell? rich lean?
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