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ZOERA,
I doubt whether a bad alternator would show the symptoms you describe and still be able to start the car afterward. If the car starts to miss at speed, turn the fan override switch on. If there's a problem, the ammeter will show on the negative side and the missing problem will get worse. I would suspect a bad connection somewhere, a bad coil, or a bad MSD would more likely be the cause.
There's also the possibility of the opposite problem: an overcharging alternator. Put a voltmeter on the system and check that you've got 14.1-14.7V at 2000 rpm with a charged battery. Any more than that is not good.
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