1988 s10 runnin rough

i have a 1988 s10 with a 4.3 V-6 and i am havin the same trouble. im losin power and its runnin rough. i have replaced alot of the parts u replaced converters, fuel (http://www.automotiveforums.com/vbulletin/../#) pumps, wires, battery cables, etc. if u fixed your problem could u please let me know wat u did or wat was rong with it. im all outta ideas about wat to try next. thank you.