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my 91 JDM S5 is doing the same thing. it seems as though the secondary injectors might not be kicking on. The main realy switches power to the 2 primary and the two secondary injectors individually. You need to start the car and pick up the idle to about 3000rpms and listen with a stethoscope (or a long screw driver to your ear) to see if the secondary injectors are ticking.
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