Yes, plugging the harness plugs into the wrong injectors would be harmful. Don't do that. The correct plug is generally defined by the length of the wire needed to reach the injector. If you're struggling to get the plug to reach an injector, its the wrong one.
The injector firing is controlled by the computer and follows the firing order of the spark plugs. I believe the computer receives input from the Thick Film Module to determine which injector should squirt next, but I'm not certain.
In any case, plug the correct harness plugs onto the correct injectors.
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