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most 4 cylinders have a 2 up two down piston orentation .. so it may be possible to wire 2 injectors so that the engine gets half the fuel, but i suspect that the other injectors will open more to compensate for the added drag of two cylinders not firing yet still compression air.. not to mention the computer may freak out and throw the check engine light on for you ..
really at idle there is just enough fuel to turn the engine over.. lowering that speed would most likly be a computer mod to make it happen.. on my carbed car i have it idling about as slow as it can.. but i have a little adjustment screw to play with.. on fuel injected the computer does all this.
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