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The description you give is an identical problem that I had at one time. I did all the things your describing everything from the tune up to the injector s. I had this problem for almost a year before it set off the mass air flow code. Once I replaced that all was fine. The distributor happened after and had almost the same symptoms. Im not sure that you can check it but the MAF sensor is were my finger would be pointing towards next. The injectors would cause more of a constant problem than an intermitant one. Hope I've helped.