The ornamental design for a carburetor/throttle body, as shown and described.
FIG. 1 is a front, top, and right side perspective view of a carburetor/throttle body with broken lines illustrating only the environment and forming no part of the claimed design.
FIG. 2 is a top view of the carburetor/throttle body.
FIG. 3 is a right side elevational view of the carburetor return spring housing; and,
FIG. 4 is a front elevational view of the carburetor/throttle body.