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V6 or V8 ? Both engines use a flat cap and standard rotor. The coil is triggered by two modules, one inside the bottom of the dist and the other mounted on or near the coil. Any of these parts could fail. You would check to see if all of the plug wires are dead, and if the coil and module has batt voltage with the key on. Also check to see if the coil will fire if not connected to the dist cap.
Not sure what engine you have in your car? If you have the V8 then I think you should have a cap and rotor. If so change them. The V6 may just have a coil pack. Just follow your wire from the plug and the other end either goes to a cap or a coil pack. Did you replace your fuel filer? If not then do so and if that doesn't help I would perform a fuel pressure test to make sure the fuel pump is working at the proper pressure.
you said you repl dist cap that means you don't have a crank sensor you have electronic ing module. remove your elec ing module have it tested most auto parts stores could test your module, or check your coil at the neg terminal. should have power. if not you lost your primary volt from your batt.your secondary power is coming from your electronic ing module from the module to the pos terminal on the coil, when the eng cranks,from the coil to the dist cap , from the dist cap center to the rotor then out to the plugs,this all happen pervided the timing belt or timing chain is ok. the cumbustion chainber needs 3 things , thats fuel, air, and spark.
Check the ignition timing. Sounds like it is running retarded ignition. Make sure the new parts you have replaced are the exact fitment for you vehicle and that they are fitted correctly. I had a nasty habit of fitting HT leads half on the spark plug and made the car run bad.
there are many things that could be wrong... evn though this caprice does not have points it does have a cap mounted coil that could be bad, also under neath the dist. is wuts called a pickup coil this coul also be bad. try a simple tune up first..plugs wires cap and rotor, new cap doesnt come with coil so you have to swap your old one into the new cap. getting a new coil wouldnt be to bad of an idea