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on cars ive installed kill switches and injector cuts, there is no stumble or funny acting. I think cutting spark or fuel happens so fast the computer doesnt "see it." This is different than let's say unplugging sensors, an injector or a spark plug. Doing this lets the engine still run poorly for many revolutions. The other sensors will detect erratic operation, and have time to trigger a check engine light, probably limp mode.
cycling the ignition key during EOC doesnt make the car act funny. installing a switch inline with a key isnt going to change much. I think we are reading way too much into it. i think the argument lies in cutting the fuel when the car is running not the spark.
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