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Once the wires were routed, plugging in the connectors was a snap. While installing the injector plugs, we found a slight problem. The harness is designed for the 5.0 engine, which has a different firing order than the 289. Since this Ford EFI is a sequential fire (one injector at a time sprays) instead of a batch fire (one bank of four at a time), half of the injector plugs had to be moved out of the harness to their respective firing order positions.