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I dont know that particular model, does it still have a distributor? I doubt it does, but if it did, those sound similar to a problem within the cap and rotor. You wont notice a miss nearly as bad at higher RPMs, or under a rich condition, such as a WOT or a quick accell.
I, personally, doubt the Cat is to blame. If its clogged enough to cause problems from mega-backpressure, then it would have an effect throughout the powerband wouldn't it? Especially at high rpms when its moving more exhaust. Also, if its clogged, chances are that its not doing its job at reducing emissions. In which case, the after-cat O2 sensor ought to notice the lack of HC reduction. Which, if bad enough, will throw a code, but it will be emissions related, instead of spark related.
Without looking at the car, and doing some tests, its really hard to tell what is actually wrong. I would check compression, spark, and fuel first probably though. Just seems like over here, clogged converters really dont happen very often. Broken, or old dead ones are common, but we dont seem to find them clogged too much.
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