My miss began after my fuel pump failed. 1997 S10 LT. Has been sporadic for nearly 3 yrs. Have done following:

Fuel filter-WIX (removed and blew out fuel lines in case of blockage)
Plugs-AC Delco
Wires-Belden
Cap-AC Delco
Rotor-Echlin
MAF sensor-AC Delco
EGR valve-AC Delco (Gasket w/screen)
Fuel inj. spider-AC Delco
Burnt Exh. Valve-Melling
Distributor-Rich Porter New
ECM-AC Delco
TPS Sensor-Echlin
Catalytic Converter-Hollowed out

Am no longer getting any codes. Still misses.....oddly enough seems only in wet weather. About to turn 180.000. Runs great 89% of the time!

Hope this helps someone, and if you have any ideas, Hit me up!