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Opti, plugs, and wires are newer. Itll run fine most of the time. Usually on hotter days itll act up. On start up itll be fine then 4-5 min itll start running rough with slight miss.
Edit- stock 94
Edit #2- Also recently replaced fuel pump, has new fuel filter.
my first instinct would be opti.....
as i have just replaced mine because it was acting very similar to what you are describing.....
when was yours replaced?
also...., do a basic check of your wires..., and make sure they are on tight and corrosion free....., especially the coil wire....