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It could be a host of things, really. A bad plug, or plug wire are the most obvious. Replace those, as they are easy, and inexpensive. It could just be a one time thing, too, where the engine hiccupped, and it won't happen again.
When you say the did a tune-up, what, precisely, was replaced? I imagine plugs were, but what about wires? If they weren't I'd look there first.
I highly doubt that a coil or ignition control module would cause this, as it's only on one cylinder. I realize that it can happen, but I sure wouldn't start there. Good luck, keep us informed.
By the way rubyee, I drive the same car, only an Oldsmobile, but the running gear is the same.
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Generally speaking, if you were to get what you really deserve, you might be unpleasantly surprised.
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