Chevrolet Repair: 1994 Corsica, coil pack, fuel pressure

Question
I have a 1994 corsica 3.1L V-6 it will sometimes start and other times it won't. it acks like its not getting fuel to the cylinders or not firing. we have put new fuel pump in it, new fuel relay switches.we checked the fuel pressure going to the injectors.  we even checked the coil pack. if you have any ideas  of what the problem may be please let me know

Thank you for your time and help.  

Answer
You need to tell me which is it you do NOT have.

IGNITION to the spark plugs and or FUEL PRESSURE & VOLUME ?>

Pull a spark plug and tell me what color is the electrode ends.

Has the CHECK ENGINE light ever illuminated on the dash ?.


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