My 2000 Deville has a skip in the motor, but when I touch the wire from the harness that plugs in…

My 2000 Deville has a skip in the motor, but when I touch the wire from the harness that plugs in the rear coil pack, it goes away, but in a few minutes it starts so skip again.

check for shorts on that wiring, especially loose or corroded connectors that often get water inside and turn greenish when you unplug them

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