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gas system problems?

  1. 2nd Generation Altima (1998-2001)
    What's wrong with my car (1998 Nissan Altima GXE)? Symptoms: a) Rough idle at red lights; wants to stall. Seems to be less of a problem when gas tank is half-empty b) Gas flow to engine seems to vary on level road even with constant pedal position. Gas flow is more uniform when car is going...