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i have a check engine light that comes on sometimes then goes off at times, i can smell some exhaust fumes in the car at times.. and if i get on it and let off sometimes the car cuts off.. does anyone know anything about these signs?

I have a 2003 Protege/ mazda speed and i took off my maf today to see if mabye it needed cleaning. I took off my negative bat post and and took the sensor out and it looked nice and clean so i put it back in, i took it out afterwards and now its cutting out really bad around 4000 rpm and has no...