my jimmy ran real bad, backfiring, cutting out and now has quit running

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my jimmy would run real good then start running bad: lose power, backfire, go dead. I could for a while disconnect the battery for a while and it would act right for a time.I could be driving and it would mess up and then start acting right again. the last time I drove it, it would not crank until the next day. I got it home and it has not cranked since.All of this was happening after it got to operating temp. I have since put in a fuel filter and pump,ignition coil,distributor module, rotor button cap and distributor cap.