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The pri injectors run up to 3000 rpm and then the sec injectors join in the game if the load and rpm tell the ecu to bring them on line ( all running at the same time ) .After about 85% duty cycle the injectors run as if they are open all the time so they are out of control .Running both together below 3000 rpm and low load ,idle will not work very well plus no need for it .
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