The ornamental design for an automobileignitioncable ducting, as shown.
FIG. 1 is a top plan view of an automobile ignition cable ducting showing my new design;
FIG. 2 is a front view thereof; and,
FIG. 3 is a left side elevational view thereof.
Portions of the automobile ignition cable ducting shown in broken lines in the figures are for illustrative purposes only and form no part of the claimed design.