I know this post is old, but just incase anyone else has the above problem, in my case (Kia Mentor '98) I had to replace the distributor cap. Hesitation was due to a 'carbon track' that had developed. Easy to check for this, Google and YouTube videos are very helpful. Highly recommend giving it a go before investing effort (and money!) into other possibilities.
If your engine tends to idle rough it is probably a sensor. Mine would idle rough and disturb my mass airflow sensor located on top of engine. It may also be a knock sensor from engine knocking.
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