Vehicle dies, won't start unless touch the PCM while turn key

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Backfires a lot and dies when slowing down. I have just replaced the Crank Sensor. Started fine and dies two minutes later. Had to have someone turn key while I touch the PCM. Starts but will stop without notice. Hard to start by yourself. I cannot find replacement plugs that go into the PCM. Does that require a new complete wiring harness?