STD IGNITION SERVICE KIT WITH MACE DFI MODULE FOR HOLDEN CALAIS VT VX VY ECOTEC L36 L67 S/C 3.8 V6The cause of an irregular misfire or a stumble under load may be due to a failed component of the ignition system. This standard ignition service kit includes everything required to freshen up the ignition system on your Supercharged V6. This ignition service kit comes up with a Mace DFI module that creates a spark strong enough to ignite the air fuel mixture and to control the timing of the spark plugs by opening and closing the ignition coil ground