I have a 1993 j30,it runs Rough, been sitting for years, what's the fix? on 1993 Infiniti J30

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I'VE had several mechanics look at it, to me it's something electrical however, the last shop said 3 of the 6 injectors needed replacing. when at a traffic light it shakes, when I accelerate it hesitates for 15-20 sec then it gets up to speed. Can any relate to this problem. Also the radio dose not work and there is a constant drain on the battery, I've replace the battery for the last 3 years. help please
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thank you very much your answer was very helpful. what would be a fair price to install the injectors (3)

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