Found broken pieces of gasket on distributor body, I think water and humidity were getting in there, took distributor apart and resealed it with permatex, it hasn't misfired again, I did not have a chance to log readings on scanner but will do it hopefully this upcoming weekend, weather permitting it's over 100 F over here.
1996 Geo Tracker, CAMI, 16 valve, 5sp, 4x4, soft top, 2 door, no a/c