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If the '91 is built like my '90 these trucks have some electronics in a bad place. Between the front seats is a console - open the top and lift out the tray - do you have a silver box there? - some design wizard should not have put this bit of solid state electronics in there with out a proper way to cool it - leave the tray out and the lid open and drive it - if the odd problem goes away you may be over heating this guy - as these chips get older they may well be less heat tolerant - I installed a cooling fan in the compartment and two things - rough idle and stalling - when the beach temp was above 90f - are gone - 30k miles ago.
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