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...OTHERS AIN'T? have a 1991 pontiac sunbird 3.1 and we replaced the computer, coil pack module, crankshaft sensor, but still the back three injectors work but the front three won't
You might want to check the injectors themselves they will go bad, however if you had a simultaneous failure of all three then look at any wiring or the fuel rail to see if there's any apparent damage.
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