91 topaz 4cyl auto intermittent problem

Intermitent engine problem where engine starts to miss and loses power and eventually stalls out. Let it sit for a half hour and its good to go. Has happened twice, both on hot days after about 1 hr of highway driving. Dosn't seem to be a fuel issue as preasure is ok (was not checked while problem was happening though). At this point wondering what is best strategy to deal with it. Don't want to get into random part replacement, but wonder if it is a waste to get it on an analizer since it is intermittent .

Any thoughts?

TIA F. plant

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F. Plant
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