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How does a person get injector drivers for a KIA Spectra? How are they installed on 2003 Kia Spectra

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Injectors in # 3 & 4 cylinders will not close enough or entirely when the engine is idling, floods engine and kills. Bigger problem when the vehicle is just starting, cold, driving at low speed, at a stop sign. Longer driving time and distance correct the problem for a while. Injectors have been cleaned, wiring checked, replaced: mass air flow sensor, throttle position sensor, gas pump, gas filter and cleaned out the gas tank. Not a mechanical issue, not wiring, not modules.
(2) Answers
Do you have injector PULSE at these injectors when checked with a noid light?
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IF INJECTOR DOESN'T CLOSE OR FLOODS THE CYLINDER MOST LIKELY YOU HAVE BAD ( LEAKY ) INJECTORS
IF YOU DON'T GET A PULSE IT WON'T DUMP ANY FUEL