PURPOSE: To simplify the structure of a system where the intake paths of at least two cylinders having different phase of operating cycle are communicated through communication path arranged with a regulation valve, by sharing the electronic control section for the regulation valve and for the ignition timing.

CONSTITUTION: The upstream sides of the throttle valves 7a, 7b in the intake paths 5a, 6b are communicated through a communication path 8 arranged with a regulation valve 9 to be controlled through an electronic control section 11. The electronic control section 11 is constructed to adjust the opening of the regulation valve 9 while to adjust the ignition timing of control section 11 is comprised of a microcomputer 15 stored with the control maps of the opening of regulation valve and the ignition timing. The regulation valve 9 and the ignition plugs 10a, 10b are map controlled respectively through a servo motor unit 13 and the ignition coils 12a, 12b.